Randomise your selfbondage session by scoring a bingo. Complete tasks and match 4 (or 5 if you're brave) in a row before the point of no (easy) return.
If a task conflicts with any previous task, then mark the new one as failed. Make your own rules for what failed tasks mean. 10 spanks? An extra 10 minutes? You choose.
Some tasks (like binding your wrists) should only be done once you've completed the bingo board and are ready to pass the point of no return (mark it as passed, unless it conflicts). Unless specified, attempt any task as soon as you roll it.
Make sure you have a fail-safe release method and have fun :)