Fellow Big Guys - How are you accessing your own back door?

Hey all. I’m a bigger guy in ok shape, but certainly not at my most flexible. I’m a bit late-to-the-queer-party for my liking, but I finally got over enough of my nonsense to experiment with anal stuff on myself. Major problem I didn’t anticipate: How am I getting back there with any real leverage or starting power? I tried squatting and reaching both from the front and behind, but it’s too much effort to keep going with any consistency for sustained pleasure.

Help a guy out! Also, I learn visually, so pointing me towards other posts or resources would be greatly appreciated!