Whew! I've hit two writer's conferences this past month, with another looming next month and one more the month after. When it comes down to it, sometimes I have to wonder if I really need to go to all of them! In this case, I did and still do, but here's a guide for you so you don't overdo it.
1) Plan your budget. If you can't afford it, you may have to reconsider a few.
2) Try and narrow down your writing plan so that you choose conferences that fit your needs the most.
3) Decide what the purpose of attending is: Are you there to learn new techniques? Network with other writers? Do a little shmoozing? Your motivation could be your guide.
4) Try and see if you've done anything worthy of being asked to serve as "Staff" at a conference. Any volunteer work on Committees or Boards could also garner you a free invite!
5) Most conferences are split up into days or sessions and you can always decide to attend only a portion of the conference. Also, skip the meals if money's tight. (They're usually not worth it!)