I would not attempt this unless you are jigged up and experienced.
Instead take it to a pro Luthier and you live in an area with plenty of them. They will have a saddle jig and perhaps a saddle mill, we have both.
The process is to measure the scale length and then determine where to widen the slot the back, front, etc. It may be that the compensation is insufficient or too much too. All of this can be corrected including plugging the entire bridge and recutting a brand new slot in one hour's time or less. That makes this not a very expensive repair to have done commercially.
Should be able to have a new, correct saddles slot of any appropriate size cut for a bit over $100.
To give you an idea how precise this needs to be our saddle mill which is the gold standard and the last one we sold was close to $4K is vacuum clamped, laser guided and will make lunch for us if we ask it...
But seriously this is an operation that I would not even attempt in my home shop even though I've done it many times if I did not have a proper saddle mill and jigs to hold it all in place.PS: We don't do shipped in work so not trying to get any business we have more than we need and turn most of it away these days.