I had one session where she prodded around, told me what's what and gave me exercises to do (also a leaflet detailing them). I then got a NSH referral, saw her colleague about a month(?) later and she said she was really pleased with the progress. She agreed to call me a few weeks later to see how I was getting on and for me to decide whether I wanted to go back. When we spoke, I decided I needed one more session - i'd had two small pee incidents (mainly through unexpected laughter) and I figured another session wouldn't hurt.
The key is to do the exercises properly and regularly, and then to start lifting pelvic while you do everything e.g lift baby. So hard to remember but the more often it's usefully engaged, the stronger it will be in the right situation.
I don't know what the service will be like where you are, but I was really impressed. And, I suppose, it also depends on how weak your muscles are etc.
How many months is it since you've had your baby?