It depends on how bad.
Just because you’ve just noticed it, doesn’t mean it’s not been leaking and building up soot/tar for a long time.
Possible damage is a worn injector seat in the head, or injector damaged so it won’t seal with a new washer. Very worst case scenario is needing the injector machined out, but the engine could run for a long time before it actually causes any problem.
It all depends on how badly sooted/tarred up the injector is into the head, as to how hard the job is going to be, and you really don’t know until you try. I’ve seen injectors buried under copious amounts of tar/soot buildup that have come out easily, yet others with minimal buildup result in big pullers and lots of damage.
If you do attempt it, rags to plug any openings, a small hammer, various small screwdrivers, small wire brush(es) and a hoover are essential.
I’d suggest stripping just enough of to get access to whatever clamp holds the injector in, start the engine and slacken the injector clamp slightly. If the injector moves/the leaking/popping gets worse, you’re in with a good chance of getting the injector out with minimal hassle. If on the other hand slackening the clamp bolt a couple turns doesn’t change anything, it’s going to be a problem.