Where is the lump located?
There are a couple of ways to tackle abscesses. The first is to remove the entire abscess capsule and then stitch the area up again. This is a more definitive cure, but there needs to be a certain amount of laxity in the skin to be able to stitch everything closed again. The good news is that this is pretty much a definitive solution and there's no real aftercare, the abscess doesn't reform because the capsule walls have been removed completely. One of my pigs had this procedure done on her lower back and it was the simplest abscess I've ever had to deal with!
The other method, which is necessary in circumstances where it's impossible or unsafe to remove the entire abscess capsule, is to open the abscess up, drain it, and have you continue to drain and flush it until it heals from the inside out. I've been here too with facial abscesses. I wouldn't say it's 'gory' per se, but abscesses are gross, pus smells terrible, and it's a process to irrigate and drain in a couple of times a day for potentially weeks or more. Ask your vet to show you the aftercare required, but my experience mainly was irrigating the hole with a disinfectant and then gently expressing any new pus twice a day, while giving antibiotics alongside.
Surgery always comes with some risk, largely because of the anesthesia. Vet will generally use a gas anesthetic with small animals, which is safer for them, and this will probably be a pretty quick surgery for him.
All the best and please come back if you have any questions in the aftermath, most of us have probably dealt with an abscess or two so there is some good guidance available!