I also do all of my travel research and booking, but I enjoy doing it. I love tripadvisor.com, and looking at the attractions/hotels for our destination. If you are willing to put in some time, you can plan a fantastic vacation on your own.
I have been to travel agents to see if they can beat the deals I find, and so far they have not been able to, in terms of price and convenience. Travel agencies are not what they once were. Everyone who has a computer can be a travel agent. If doing the research doesn't appeal to you, see a travel agent and see what they come up with.
There are ticket options where you can purchase admission for San Diego and Anneheim parks in one combined ticket, but again, it has turned out to be a better deal to buy in pieces. We are going in February and
Disneyland is offering the "Everyone Pays the Kids Price" admission tickets.
We went on the same trip in 2003, but did not feel like we had enough time at San Diego or Disney, so we are going again in four weeks.
If I can help you with your plans in anyway, please let me know!