I am currently defretting a cheap jazzcopy and would like to share how I do it. I do not say that I am a master but I hope you can find somethin helpful. Also I want to point out that this is my method and there are others that might work better. This is how I do it.
This is the bass I am defretting:
Step one, remove strings. (some prefer to work with the neck itself but its fine to me to have it on)
You need a yellow hammer, screwdriver and [don't know the english word, check picture
Put the screwdrivers head against the side of the fret, knock carefully with the hammer on screwdrivers back.
Do exacly the same on the other side. 5- 10 times on each side (10 knocks every time)
Take the [insert english word] and grip the fret. Pull carefully upwards.
It should after that look something like this:
Keep on doing the same on the other frets
Take your time, at the end only the result will be visible and hearable.
Keep an eye on the neck, due to it now is stringless it can move. Try to keep it as straight as possible.
One fret left!
Do some sandpapering job.
Until it look something like this:
Now its time to fill up the empty slots. I am using chemical wood. (det går också bra att blanda sågspån med trälim om man vill verka smart)
Here is what you need, lacquer, chemical wood, brush, putty knife, sandpaper.
I will use this swedish lacquer:
Fill up with chemical wood, make sure it come deep down.
Don't be scared, it will look nice later.
You can take how much you feel like, if you take too much you are on the "safe side". But it will give you more sandpapering work.
Be patient it will take some time.
Now use a finer sandpaper, it will in some time look like this:
Time to varnish. THIN LAYERS!. 10-hours to dry. Make sure the place is clean when you put the lacquer on, we don't want any dust around.
First layer of laquer layd.
Too be continued...