To ensure fretting goes well make sure the fret slot is clear of paint, dirt and debris, use a fine knife or just go through the slot with a saw to clean it out.
Get some fret wire and Pre Bend it, you can do this using a fret bender or by sticking one end in a vice and bending it over.
Cut the fret off slightly longer than the slot, and before fretting add a dab of super glue on each end of the fret and tap the ends in to the slots.
After taping the ends in you then tap the middle in to the slot, the reason for the super glue on the end is to stop the end of the pop up when happing the middle down.
After all 24 frets are installed, the edges are levelled off and bevelled for comfortable playing.
If you have realized I have not put the zero fret on. There is a reason, before I install the zero fret I make sure the frets are level by using a spirit level with wet and dry sand paper on the under side and run it back and forth just to take the top off the fret. To see which are high and low I have put Marker pen on the frets to see which have been touched by the spirit level.
The top of the frets are then flat, if this is the case you will need a Gurian Fret File this Is used to round the top of the fret over, its important to do this as if its left flat it will affect tuning and intonation.
I then after levelling and polishing the frets with T cut, and wire wool, I install the Zero fret, The zero fret is higher than the rest of the frets therefore installed last.
After this installed its ready to play and should look like this:
I would advise you finish the neck before fretting, Some people finish and lacquer the board with the frets in, the problem you will have in the future is when it needs a re-fret. And the Red Special is finished entirely with Rustin's Plastic coating.M. TIP - Some people use something called sanding sealer, this seals the wood and so when you spray on to it with lacquer or die or stain it give its a smooth surface and also doesn't need as many coats of lacquer to give it a flat / level finish.