On the scale of things, the number of hours at which you solo doesn't really matter, especially if you're going onto higher things! It can be anything from 10 to 50!
One thing to beware of, is the lack of the couple of hundredweight of instructor next you; if you use the same power, you'll end up shooting skyward at a hell of a rate. Secondly, the hover attitude will be slightly different. I soloed in a left hand drive Schweizer which hangs left skid low anyway. Without my rugby-proportioned instructor next to me in the right seat, the aircraft really did feel as if it had a list to port!
Lastly, if you don't feel comfortable with your approach, go around. Even if you do feel comfortable, you can go around anyway - you're in charge!
Wish I had!
I actually felt though that my first solo cross-country was the start of really flying.
Cheers
Whirls