Ivf uk ?!? Anyone any advice !

So today we have decided to go for ivf! My partner has a low sperm count 5 mil per ml and 20% mobility. This is our only problem. If anyone can give me any advice this would be highly appreciated!! We will have to go private but are prepaired to get a loan to cover costs. I don't if I should just pay for 3 cycles or 1 ? What clinics are good ? And how quickly will the process take ? What is the process ? I have done research but it's not the same as real people and experiences. We have only just decided so haven't got a private doctor yet. We have had 1 miscarage in the 18 months of ttc!!! Thanks everyone xx