Here is some info about my two cycles as one was Antagonist and one was Long Down Regulated so it will give you an idea of how they differ. I think they start most people on Antagonist first and if you don't respond well then consider Long Down Reg after this but each person's circumstances and FS are so different.
My first cycle was antagonist - Gonal F 300 then from Day 5 I started on Orgalutran 240 to stop the eggs accidentally triggering then PM trigger on Day 9 (Ovidrel). I got extremely cold during EPU and got sore throat then the flu so keep your top nice and warm under your surgery robe and ask for them to keep you as warm as possible. Most people are fine but there is no reason to risk it. You need to be in peak form throughout this process. My transfer on this cycle was cxl as no embies made it past Day 2.
Cycle #2 was long down regulated using ICSI. This meant Lucin for a week before starting Gonal F on first day of AMF (this was taken as well as continuing with Lucrin). I personally found Lucrin effected me strongly and I felt depressed while I was on it but as soon as the Gonal F started I felt back to normal again. Given our dissapointment with the first cycle FS suggested Saizen to support embryo quality so I took this with Gonal F until my trigger date. My trigger was Day 11 (post AMF) which was Ovidrel. My EPU was D13 and we collected 3 eggs all fertilised via ICSI. Both were good so I had D3 transfer and we tried to grow the 2nd embie to blacocyst for freezing. It made it to early blacocyst but not quite good enough to freeze. Post transfer I took 6 clicks of Ovidrel D2post EPU and D6 post EPU. Clexane was started on my day of transfer since my NK cells are slightly high. I started Crinone AM + PM D8 post EPU as I felt I needed extra progesterone support. My FS didn't believe this was necessary but felt it would either do nothing or perhaps help so didn't have an issue with this.
I hope this helps a bit. It's a bit of an essay but I thought I might give you a bit of a look at my two cycles as it does help for you to then know what questions to ask either your FS or any of us - we will help in any way we can to answer questions