yes, it takes time to adjust to girth...to be to the point, it's taken me years. I started slowly on my own with butt plugs. When I got use to those, I finally went for small dildos; some very cock like with balls attached. These were about 5 inches and the girth was very thin too. Once I became use to those I went a size larger; to 6 inches and thicker girth...each time with these it was about a 3 month period where I would get really use to them. I then finally got up to 7 inches with even thicker girth. This one had a particularly large head. It took me several times to finally inch my ass down onto it little by little until the pressure gave way to clear space...it felt fantastic as I jacked off riding it with my ass. Once I came however, it wasn't very easy getting it out of me. During and after orgasm, your ass will clamp down on the dildo or the dick...I had to take my time getting it out and it was a little uncomfortable but it did come out of course. Since then, I've done it another 3 times and the last time I had no problem removing it at all; the body does adjust. It really does take time, practice, and patience.
What's nice about this is that it really does prepare you for the real thing. I remember during the time with the 6 inch ones, I got together with this guy that wanted to fuck me. I was a little nervous and worried at first. But as it turned out, he slid into me with ease and there wasn't any pain at all...I didn't last long as I came 5 minutes later from him fucking me and jacking off at the same time....a great orgasm.
There was a time I had no patience and when the discomfort happened, I stopped doing it altogether. About a month later I was at it again. In my opinion it really is worth it because the orgasms can be so intense.

with that size.. i do believe you