Bob...if you are in a 5.9/5.10 rut, the next level is hard...its like bench pressing...your max is 220, then 220.5 is gonna be fuck-hard!
How long have you been climbing??????????? Well, if you've been climbing for 4 months, a book like Horst's isn't such a bad way to improve...its got a system approach, and breaks down a lot of different areas...again, remember, its targeted to total rank beginners...
(i know the guy...he's a dork in real life, we climbed in the same areas in the late 80's/early 90's and he's a shameless self promoter)