A week is bad. Most cue guys do it on the spot in 5 minutes and hand it right back.
If you do it yourself, it really is best to get a small cue repair lathe and learn how to do it right. That way you won't butcher the ferrules and shaft.
When I have to do one myself in an emergency, which is rare, I have a set of bits I use with my drill. I scrape the ferrule top with a utility knife or razor, scruff the glue side of the tip, use superglue gel to glue the tip on, wait 5 minutes, tape around the ferrule to protect it, then mount the shaft on the drill. I staple a piece of 80 grit sand paper to my workbench, then holding the shaft nearly flat with light pressure against the tip and paper, carefully sand the excess off the tip. Once roughly shaped, I switch to 150 grip then finish with 400 grit. If the ferrule gets scraped, I use 400 wet to remove any scratches. I shape the tip rough by holding it at an angle to the 80 grit and finish with a tip shaper.
Sounds long but takes about 15 minutes.