Tied up. Okay, but I hope you have some sort of safety feature. You know, a partner who'll come home and find you or a phone you can get to while tied up. I can't advocate tying yourself up without an escape clause.
1. Get naked, tie yourself up. Lie down on yuour side and face the wall. Keep your nose and knees pressed against the wall for ten minutes.
2. Try to masturbate with both hands tied or cuffed behind your back.
3. Tie your legs together, like shackles, and kneel on your hands and knees. Stick something like a dildo in your butt and pretend you're getting buggered by a prison guard.
Maybe I'm a novice, but this whole trying to tie yourself up thing solo doesn't seem like a great (or versitle) way to do things.