I was in the same boat as you are, I had roughly 8100 hours to log. I bought Logbook Pro and got to work, starting with my first discovery flight 18 years ago. It took me a couple of months of plucking away at it, but I did leg by leg and it was a pain in the ass. When I was all done I brought the electronic file to the FedEx store and had it printed. It was worth the time and money and most importantly, Delta seemed to like it...:-)