You said self bondage, so try this: set up a timed release (ice lock, timer, whatever works) and a backup release (even better: have someone come to your house shortly after you are supposed to be free again).
With that out of the way, here's how to tie yourself. Tie your feet to the legs of a large table. Then put thumb tacks on the table where your breasts touch the table if you bend down. Then put a rope over the back of your neck. The goal is to make it so tight you can't stand up all the way but are forced to bend down hovering about 10 cm over the thing tacks. Finally, apply a liberal amount of hot sauce to those tiny breasts and tie your hands behind your back with your release time set to 60 minutes. Your muscles will probably give up long before that, forcing your burning tits down on the thumb tacks.
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