I have found the following to really help me get going fast. I use a recorder and my imagination to tape my handjob fantasy. I go into detail about who I want to do it and how, describing every detail I desire. I use real people's names that I know in the recording and that really helps, plus using Vaseline as well. I turn on the tape and enjoy.
I can let my imagination run wild and replay the tape as often as I want.