Both of my dogs are in training for PP and PSA. Are you looking to get into actual personal protection or sport work? Many dogs who can do sport work (PSA, FR, MR, ScH) aren't cut out for PP. Though having a dog trained in any form of bitework requires the handler to have a higher awareness and respsonsibility of their dog, having a dog trained in actual PP is even more so.
Personally I adore the work and frankly don't mind the responsibility of it. The problem comes, especially in PP, in finding a good trainer. You need to find a trainer who actually understands dog behavior and doesn't want to make your dog aggressive, rather wants to figure out what turns your dog on. This is a VERY difficult thing to find. After emailing and/or visiting around 10 places within an hour and a half drive of me, I finally sucked it up and now drive 1.5 to 2.5 hours to train up in NH and ME (we switch up where we train) where I know the focus is on a social dog and where I also know that the decoys know how to work Bulldogs (since it is much different from working a herder, ESPECIALLY in the beginning stages). So if you have a GSD, a Mal, or a Dutchie you don't really have to worry about that part of it, but owning an "alternative" breed makes the already difficult search even more difficult.