Eupho Sun Trident just shipped. What should I expect?

After watching lots of vids and reading some comments I ordered the Eupho.

This will be a first time experience for anything other than a tongue in there.

From what I read 2 inches in is good? Then contract muscles with a little pressure to find prostate?

Do you put it in after erection or before? Or it doesn’t matter?

What experience should I expect? Is it really that much a better orgasm?