I did IVF twice in 2000 (and 3 times in 2005, plus 2 other operations), so this is probably out of date, but at that time statistics were published and some clinics were way more successful than others, particularly if you were older. So, if possible chose your clinic carefully.
At that time, there were many experimental things my clinic tried (not to me as it happened), so apart from a basic knowledge of what IVF was, there was too much to know and I couldnt become an expert or participate/contribute at all. I found this really frustrating at the start bit of a control freak.
So, I trusted the clinic, asked few questions and did exactly what they said. Actually not knowing too much did mean I also didnt know what there was to worry about, so I was fairly naaively positive about it all.
Dont compare yourself to others, to even yourself on another round, each person, each diagnosis, each round is unique. Give yourself every chance of making it work. Eat well, dont drink, smoke. Rest up, dont stress. Dont give yourself any reason to think its your fault if it fails.
For me at the time, it was all pretty horrible, exhausting, expensive, painful, all consuming etc etc. But I took a breathe and dived in, there was no way I wasnt going to do it. And now, with 2 children, it seems a very small price to have paid.
If you truly want children, then this has to be done. Its a step, hopefully the final one before motherhood - but even if its not, its a step that has to be taken on the journey.
Good luck xx