Anxiety is a problem. When I first went to P4P in Japan (a soapland), anxiety was really a problem so that I couldn't turn on for a very long time. Reason is that I had N5 Japanese not communicable with the girl, so I did not know if there were some "no"-rules or unpolite behaviors. It was difficult to ask via a translator in that circumstance.
So my suggestion is: don't think too much on the price–performance ratio or try all ways of playing in your first time. Just let the girl take the lead, let her instruct you what to do next. She will ask if you are comfortable or want to change or something. Normally the girl is more expertised than you.
I do not recommend to go to Shinchi before you have overcome the anxiety of such activity. In Shinchi, the time is short (30min Tobita / 40min Matsushima = less than 20min main course before the bell rings). So in your mind there is a clock ticking, pushing you to the end. Escort (deli heru) and soapland are better because you have 1 hour or more to play.
Besides, have a good rest before you go. If you feel tired that day, don't force yourself to.
Condom is not a problem. The girl will bring some. Sure you can use yours if you have perference.