You can do it...but for gods sake, get the right tools!
I had the honor of doing my fork seals for the first time last month. One ride on the new seals and they were leaking like my kids snotty nose on the first day of school.
Upon reflection, I'm sure it was probably due to the homemade pvc fork seal driver I used. I probably didn't seat them good enough, or tore the crap out of them trying to get them in.
Low and behold, I got a new set of seals, a seal bullet, and a real-deal fork seal driver. I went through the drill again which was much easier, and so far, no leaks!
Moral of the story: ALWAYS GET THE RIGHT TOOLS...Don't be cheap!