Driving tips!! UK

Hannah
Hi, I've just passed my theory and haven't started any proper lessons yet. I have only been out in a car park with my mum to get used to starting the car.
I find it so hard!! I'm so shakey and I can't get the revs to stay the same while I'm concentrating on moving my foot off of the clutch!! I really cannot do it!! I can't do it atall at the same time without panicking, it's awful. How can you keep revs level while slowly bringing your foot up?
Any tips? Or were you like it?