Hi there! I' going to try and answer a few of these!
Comparing to mainstream kids- I panicked a lot about that when mine first came out of school. And of course, you can download the govt targets/ levels for school children fairly easily, buy test books for the relevant age if you like, and use those. However, the longer my two girls have been out of mainstream school, the less I've worried about this. Frankly, who cares? My main aim is that at the end of their home education journey they have whatever skills they need to take them to the next stage of their life. For my eldest, this means doing GCSEs at the moment. But not all children will even need GCSEs to do what they want to do. Also, if you compare UK to other countries, we get our children into formal education much younger, but they don't do better at the end of it. I've seen so many children in the home ed community who can't read at all, in the slightest, at 8 or 9, or even 10 or older, but by the time they are teenagers read better than your average schooled child. Comparison isn't really relevant.
What if one kid is a lot cleverer than the other? all the more reason to home educate. Schools give children labels, they put them in streams, they mark out the clever from the not so clever at 5. Home ed you can work at each child's pace. If I was going to talk in a merely academic sense, I definitely have one child cleverer than the other (I'm not saying which!). This was very noticeable in school where each child is given a level constantly. At home they each excel at their own individual talents, so it isn't an issue.
Classical education - home ed can be whatever you want it to be. I have many autonomous friends who do a fantastic job; we are a little more structured. We certainly do lots of music and Latin, but because the girls enjoy it rather than because we work from a classical ethos as such. I think their education is going to look very "individual" at the end of it all! The LA man said he thought that was a really good thing as employers and unis see only the same, factory produced children nowadays!
TV - there are different ways of playing this. At the start of my home ed journey I made a "no TV in school hours" rule which worked very well at the start. After a while sheer laziness stopped me caring and I just let them watch whatever, whenever. After about 1000 episodes of Spongebob, the TV seemed to burn itself out. Same with facebook (my children are a little older!) Nintendo Ds, etc. After a while they do get bored and move on to something else. Lots of people have confirmed this too me. Today we haven't done much of any set structure and the TV hasn't gone on once yet. It's always there if they want to watch it, so most of the time they don't bother. You have to be quite brave in the wall to wall 24 hours a day phase, though!
Friends who school educate - we are 2 and a half years on and most have adjusted now. It wasn't always easy. I nearly lost a couple of very good friendships, one in particular, but they seem to have weathered the storm. People do tend to take it as a critisism of their decision to send their child to school, no matter how hard you try not to make it like that. In the end I had to think that if other people's opinions stopped me from doing what I truly believed to be right for my children, I'd be a pretty poor parent.
There is lots of special needs help on here, and people could point you in the direction of specific groups. But diagnoses are often for the benefit of schools who need labels to bring in extra resources. They're not always relevant at home. If you haven't needed outside help yet, that won't suddenly change at the magic age of 5.
If you are ill - I love the fact that home ed is so flexible. I've just spent 2 weeks in and out of hospital. For two weeks we just dropped any formal work. This week we are back on track. This week is school half term and last week wasn't - so what? It's taken me a while to think like this! It's taken me a while to realise that we can work in the venings, or at weekends, or take huge chunks of time off, or concentrate what we are doing into a really intensive block - or whatever suits us at the time. My hubby had them for some of the time and my sister for some of it. My nephew was soo envious that they didn't have to go to school in the mornings! And I had utter peace of mind in hospital because there was no homework to worry about, no lunchboxes to pack, no uniforms to wash, no need to find someone who had to drop them off at school at 9 and be there at 3. Had that been the case, I'd have been stuck - my nephew goes to a school 10 miles away so my sister couldn't have had them then. And for 2 weeks they could just be, just chill out.
I do hope this helps. If you do decide to embark on the home ed journey, you'll have a world of fun awaiting!