Do it! Have fun! I'm assuming you've been to WDW before. I'm going on my 4th solo trip in about a month, and I can't wait. Solo at WDW can be an amazing time, depending on how well you do things "with yourself", as opposed to "by yourself". Having the freedom to do what you want, when you want is the best part of going solo.
I'm happy to share my solo WDW experiences if you're interested, as will many others on these boards.