OldLefty gave me some hints when I picked a 10wt for the shore... I could consistently do 60' or so, but after that everything fell apart.
We worked on technique a bit, and it helped (yesterday, a forumite commented on how good my loops look, hah!), but the most important hint he gave me wasn't a way to increase distance, but to ALWAYS pick a target and cast to it.
Admittedly, my crippled style keeps me at around 60-70' tops, but I can consistently put a fly within a foot or so of my target at that range. I can easily cross most streams I fish with a cast, and put the fly over the riser. And its awesome when a fish takes that thing 40' away.
(not that I can hook the damnable things, but that's another thread)
So, 45' You'll be fine, just start to work on accuracy.