Irish 8s are much more comfortable for longer sessions than ordinary handcuffs, but as they are rigid allow a lot less arm movement. This means you can get stiff shoulders and upper arms

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The older Hiatt rigid 'speedcuffs' are easier to lock on your wrists behind you, but get uncomfortable very quickly.
I would think Hamburg 8s would be difficult, but not totally impossible to escape from

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I also have a set of rigid (6 inch bar) manacles with press button locks, which you can (with a little difficulty) lock on yourself, but, as your wrists are held so far apart, you need help to get out of

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Never confuse your ambition with your abilitues, if you can't free yourself who will?