I'm planning to start riding lessons again soon; it's been 12 years since I rode regularly (shared a couple of days a week on and off through teens and early 20s) & I'm a fair bit heavier (just under 12st) & unfit since having DS.
I have the option of 1 hour group lessons or 45 minute private lessons - the latter is more expensive but I expect I'll progress quicker? They are more expensive though.
Any suggestions on what I could do to prepare & get fitter first? Or do I just go for it & accept being unable to walk the next day? 
My current goals are just to get confidence back, & a bloody good seat.
What do I need? I donated my long boots as my calves were never fitting back in those but I have a pair of short boots still & picked up a secondhand pair of riding leggings in my current size. I'm guessing I'll hire a hat at first then buy my own - any recommendations?