I've installed almost every iterative patch and version that was available since 7.5 began, and I'm unable to recall any major issues. If the directions are followed, and the caveats minded, you will likely see good results. Blind patching (as, evidently, your predecessor is guilty of) can get one into trouble with any number of software products.
I understand what you mean about the instructions being challenging at times. If you would like assistance with a patch, please reach out here and I'm certain that the community will be happy to help you with the installation.