First, a little anatomy... It's a prostate inside you (the body part) not a "prostRate" (that's a position when you lie face down on the floor!) Now that we've taken care of that...
I have an anerous- and like the earlier post - which was fantastic, btw, it can be a pleasure enhancer. I don't like to "give it up..." earlier- but this deal can be enjoyable. Basically, you add some lube, and sloooooowly press the tip to your hole. The size of the toy isn't that girthy, (some turds are larger heheheh) so that shouldn't be much of an issue here- especially with added lube. You just have to relax about letting it be inserted. It tapers in size, so as you insert you might find that it seems like it will "pull itself in and lock in place."
Once it's in place, you'll feel the tip 'tickling' your prostate- and that might be a whole new enjoyable deal for you. Best to just totally relax- even put it in, walk around the house in loose gym shorts a bit, and just get used to the teasing feeling inside where your objective isn't to turn yourself on as much as just let the anal muscles relax around the inserted toy. Once you get past that step (just relaxing with it in) then you can proceed.
The anal muscles will kind of push on it a bit (trying to eject it) and when it's lubed it will move out a bit- and then that will cause the external part (the question mark-shaped plastic outside the body) to rub on your perineum. If you haven't had a partner play with your external spot here this will be a wild new feeling.
When your perineum is stimulated, this causes your muscles to contract, which draws the toy back in place, which hits your prostate again. So it's a hands-free circular loop... get it? If you RELAX with this and just enjoy the pulses pretty soon they will overcome you and you will probably begin to build a hands-free erection (if you haven't already got one) and the pulses will flow up and down your cock into the internal base (prostate).
When you finally cum, you might experience the orgasm more internally centered, rather than externally (when you jo.) This extra prostate stimulation will cause your prostate to push more fluids out (pre cum increase) and might also increase your cumshot overall.
One other side benefit is this- if you feel like your 'hose' doesn't always have enough pressure to jet out an explosive ending, having this toy inside is kind of like bending a hose over to add to the pressure of the spray- having the firm smooth tip pressing on your nut (while you nut!) will cause a more intense pumping sensation, and it can be a wicked spray or gush (whichever is common for you.)
The only challenge I have is following the big finale--- you have to totally relax the muscles to withdraw the toy- which can be an unusual feeling if you're not ready for it. I don't use mine all that frequently (maybe once every 2 months or so) but it's helpful if you're feeling "stopped up" and need some extra help for a power wash ending.
It's not a cheap toy, but search around a bit and you can probably find it on sale online somewhere. I think it's well-designed, and well made to last lubes, insertions, sterilizations, and all the rest that goes along with a high-quality sex toy. You might look at it as a health investment, because prostate massage/milking does have a place in legitimate homeopathy- and since the prostate is the center of a man's orgasm, learning to have a more intense sexual response has nothing to do with anal play being equal to anything dirty.