Need help

I purchased a helix syn 2 weeks ago and I have had about 4 sessions so far. I want some tips and to hear If I'm doing this correctly. Here's my process I live my finger up and play with my asshole. Once I'm loose I live up the helix and slide it in, I get in my back and bend my legs and sit contracting muscles and breathing for a while. I usually get some twitching in my ass and some chills throughout my body. I lose my erection and sometimes my arousal all together. Am I allowed to watch porn? What can I do better? Thanks in advance.