There are some detailed walk-throughs of guys removing fretboards -- it's labor intensive. If you've got nothing to lose, go for it.
You might focus on trying to find a clever way to get that nut off -- you might find an answer that's less difficult than replacing the fretboard.
DIY is fun, but consider that you can get a fretless neck from someone like rondo for 40 bucks -- if redoing the fretboard takes you 10 hours of work, it's like you just paid yourself $4/hour...so it'd better be for the fun of it
