Mine was less than two months ago! Theoretically I knew a lot of the basics already, so it was a case of putting them into practice and my instructor making sure my seat was okay and all, and then I had a go at moving around the arena in walk, and then in trot. It was difficult to get the hang of rising at first! But there's a moment when it suddenly clicks, and before you know it it'll all be completely automatic.
The most important advice I can offer is to relax. You are completely allowed to make mistakes, and as many as you want. No one is judging you and saying, "Oh, well, we won't let you
ride again!" Your instructor will give you a sensible, laid-back horse who will realise he's got a total beginner on his back, so the hard part will not be slowing him down after he races off into the sunset, but actually getting him to move :)
You want shoes with a small heel, and try and wear a pair of jogging bottoms or something like that. Tight trousers with a seam down the inside of the leg will leave you blistered!
We'll have to compare progress reports