Just brought a nexus revo extreme!

I bought myself the revo extreme thinking that the bigger the toy the more pressure I get against my prostate. Well, I didn’t realize how much pain I have trying to insert it I’m my ass, but once it’s in after a minute or two, it’s in and I’m all ready to go!! Love the pressure against my prostate and the 10 hour battery life!!! Speaking of which, how can I insert the extreme in my ass without the pain? The pain starts after the extreme is 1/2 of the way in the second bump is really hard to insert without feeling some pain. I am using lots of lube on the extreme and in my ass, I just don’t know what to do as having to go through that every time I use it is starting to get me annoyed!