Don't be afraid, do it yourself. My first 2 solo trips, I used a TA JUST to book my room-only res because I was afraid to call Disney. (Really) I used 2 of the most popular/recommended TA companies here, and both did fine, but I was very low maintenance, just wanted the room booked. I ALWAYS book my own ADRs and always would, not giving that up to anyone, and I actually find that kind of fun. (I have never had any trouble using the TA to book room only and doing everything else myself.)
Anyway, starting in 2014, I just called Disney myself, turns out they were super nice, did not pressure me into a package (my biggest fear), it was totally easy! The one thing I will say - my 2012 TA did get me a good discount on the BC without me having to do anything, which was nice. Starting in 2013, however, I've been at POFQ, which gets mostly NO discounts (general public room only discounts, I'm talking about), so that's less of a factor for me. That is the biggest reason I'd use a TA is to stalk discounts if I thought there was a chance I could get something good.