Hi Mark,
My money management rules are fairly pragmatic. I like to keep losses at a maximum of 20c, tighter ideally. Also depends on S/R levels, fib levels (if relevant), where the ax is... All depends on what's going on in that particular, anticipated trade. I also monitor the trade closely until I can put a stop in at break even, or if it looks on L2 (eg ax moved against me) that circumstances have changed and the reason I took the trade is no longer valid, then I'll get out, no question. I can always get back in in the future.
For me, at the moment, it's a bit like going out driving by yourself, not long after taking your test. The circumstances of the SNDK trade were such a no brainer for me that I left it on overnight, not something I do habitually, only if all my criteria are satisfied. And I slept like a babe