This is repair work. You're in the right place.
This is a difficult repair. It requires having the right tools, knowledge, and experience working to tight tolerances. Here is the basic rundown:
- Remove finish.
- Resaw slots.
- Install frets.
- Level, crown, and polish frets.
- Perform setup.
- Play
Seems simple on the surface. Removing the finish is simple enough. Sanding the fingerboard will take care of that.
Resawing the fret slots is the tough one. It requires a precision ground saw, a miter box, and a very steady hand to nail the center of the slot. The slot you filled is approximately .022" wide. A slip of the wrist and it will be larger, tilted, or no longer perpendicular to the nut. All of which are a miniature disaster that will require a great deal of work to put right.
Installing the new frets is pretty straightforward. They can be hammered in or pressed in with portable or stationary fret press. Learning to hammer in frets can be frustrating. It is advisable to make a few practice fingerboards out of some scrap maple and practice hammering them in. It will also give you some practice at sawing fret slots. Pressing frets, on the other hand, is easier. But you'll have to lay out the cash for the hardware. A new neck is cheaper. So is taking it to a pro to have the work done.
Level, crown, and polish (fret dressing) is also straight forward. It also will require spending some money on tools. At the minimum you will need a leveler (file or dead flat device on which sandpaper can be installed), a crowning file or two and some steel wool.
Obviously, to do this right is going to take some time, some money, and some patience. If you do a lot of work on your instruments it may pay to invest in the tools. If anything more complicated than changing strings is daunting, it might be easier and cheaper to take it to a pro. If you're not handy in the extreme, that is the best advice.
home made fretless Q 
