Hi longleggedlovely I'm sorry you're feeling scared, you are in the right place though, the ladies here are lovely!
I'll try to answer your questions as best as I can and based on my experience. In terms of treatment we had ICSI (embryo transfer was last Thursday). My treatment was long protocol - that involves down regging (I had a nasal spray) for around 2 weeks - this shuts down your ovaries...I started this on day 21 of my cycle.
I then had a scan to see if my ovaries were shut down at which point I started injecting a drug (don't worry, it's a teeny tiny needle and feels like a pin prick) for 10 days, this is to stimulate the follicles and encourage lots of them. On day 10 I had another scan to see how many we had and decide when egg collection is - you are then told when to take your last sniff and injection as well as when to do the trigger injection (injecting the hcg hormone) as that has to be done at a specific time. My egg collection was last Tues...They take a catheter and remove the fluid from your ovaries and count the number of eggs you have (you're sedated at the point - don't worry!). Your partner will provide a sample around this time too. With ICSI, they pick the best sperm and inject the egg with it (whereas with ivf they just put the egg and sperm in a dish together and let them do their thing). My understanding is that ICSI is generally preferred when the sperm has low motility. They then monitor your eggs and see how they fertilise. Based on how many fertilise normally, they may transfer them back into you on day 2, 3 or 5. I think if you have only 1 then they transfer on day 2 (at least they did with us)...If there are more then they like to wait to see how the embryos develop and can pick the best ones.
In between egg collection and transfer you may have to insert pessaries...an "interesting" experience! Once they transfer the embryo (s) (transfer is a bit like a smear test) you have to wait 2 weeks before you can test (still inserting pessaries!)
Now I have thrown a lot of information at you I know! So sorry about that. If you ever want to talk, feel free to DM me 
Depending on your job, you can work (unless it involves heavy lifting etc) but really it's fine. I felt mostly ok with the treatment, the down regging can make you irritable and the injections can make you feel rather bloated! Other than that I was fine...I was running whilst downregging and only stopped when the injections started. I can only do gentle exercise.
My boss has been great and knows everything! I just went "off sick" for the days off and that was fine.
Just take it one step at a time...we had one appt with the clinic and the treatment started after my next period...we decided to wait a few more months and only started in January - that was long protocol...short protocol misses out the down regging part I think.
Sorry for the essay, I hope it helps! 