Yes, how awful about that parent banning her DD from seeing Enid's! I must say, no one has been rude about our decision, although I'm sure some people think it's a bit odd or that I'm mollycoddling my DS. To be honest, I don't care and, anyway, we are having a lovely time.
The excitement coupled with cold feet sounds very normal, Fedup. That's exactly how I felt. It's a good idea to look into local groups and maybe start to plan what you might do together. My son and I started by imitating the school day (his choice because that is what he was used to), which helped us both to adjust. We are more relaxed about it now, but I still make sure he does certain things every day, eg Mathswhizz.
It did take me a long time to finally make the decision to home educate. During this time, I tried to make it work at school, whilst at the same time exploring the option of home education by meeting people who were home educating and reading books about it. Oh, and reading this topic on MN, of course. I think you'll probably know when you are ready to make the leap.
I am particularly glad that my son has missed Year 6 because it is a tough year, with children feeling stressed about moving on to secondary, some of them starting puberty and lots of SATs revision, all of which was incredibly stressful for my son. I get the impression that a lot of the year is taken up with SATs revision, with little time for anything else. If you are home educating, you will be able to spread out revision for 11+, rather than 'cramming' it all at the end.
With regard to your son getting bored of you: you may be pleasantly surprised. My son and I have developed a friendly companionship during home ed. We can always go off and do our own thing if we have had enough of each other, but that doesn't seem to happen much.
As for patience - yes, you do need patience! My son was impossible with me last week when I was trying to go through multiplication with him. He would never have behaved like that with a teacher. I kept my temper (I have had a lot of practise!) and eventually he calmed down and did the work. Although that was challenging for me, I did feel immensely proud that I had been the one who taught him something he had been struggling with.
Good luck with whatever you decide to do.