@SlimDave,
@ericmacson
1. Yes, you got it. I don't think I have ever actually found it. I can get my finger in definitely more than two knuckles deep which is far enough to feel around a lot though.
Good, glad I understood you, just about like myself - can’t get in far enough to feel my prostate except possibly the very lower edge. The prostate is located on the anterior/front side of the rectum only, under the rectal mucosa. It doesn’t wrap around the whole rectum, so with either your finger or any toy or implement used you need to find it on the front side. In my experience, when you find it, you’ll know it. At least for me, the rich innervation of the rectal mucosa makes just touching any part of the inside of your rectum when your finger or toy gets in very pleasurable. However, touching and massaging the prostate feels very different and much more directly sexual than the rectum around it. To me, touching the rectum inside feels very pleasant - but touching the prostate suddenly changes and feels like you’re pushing your “start an orgasm” button.
2. No, not really. I definitely need to go for something super thin as suggested by @JJM.
I agree that starting with getting your anal sphincter to open up and get a smaller diameter toy in might be easier. You will have taught yourself how to do it. So then I’m sure once you get a toy or probe of any size in, then getting in larger diameter ones will be much easier.
3. Yes, again you got it. I think I will try what @Nicky62 said. Counterintuitive to think about pushing something out when you're actually trying to go in, but maybe that will do the trick.
Like you say, moving your anorectal muscles like you’re trying to push out a poop might seem backwards and make it harder to get your toy to go in, but it really works. It does work because part of the complex “pooping out” muscle movements includes your body opening up or loosening your sphincter to allow poop exiting, or in your case, your toy entering you. I’ve done this many, many times with inserting wide plugs, and though you may in fact feel a slight push out from your sphincter, you’ll also definitely feel it opening to let your toy in.
Good luck, and let us know how youre doing. Only my 2¢ opinion here, but it’s really worth the effort.
Eric