I just got an aneros trident, what should I do?

Hello all, I’ve been a long time lurker on this subreddit and I’ve decided to purchase a trident toy from aneros. I’ve done some light anal play in the past (fingers mostly) and I enjoyed it some. I have some questions on how I should go about using it.

What position should I be in when I use it solo?
What sensations should I expect?
Should I jerk off a little bit before hand or should I just insert it at the start of the session?

I have some other questions but those are the biggest ones. Any advice is greatly appreciated!