1. stop and go back and fix everything until it's perfect, then go forward, content in knowing that your back end is covered.
2. Scribble notes in the margin, and go forward, trusting those notes to remind you where the problem areas are and what brilliant ideas you came up with to fix them, when you can do everything all at once, including new problems that will come as you go along.
I've done both, and find that #2 is probably the more time and energy-effective for me. You have to figure out which one works for you (but, knowing your penchant for worrying, I suspect #2 is going to get you to the finish line in better shape, and prepared to do a smashing final polish).
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1. stop and go back and fix everything until it's perfect, then go forward, content in knowing that your back end is covered.
2. Scribble notes in the margin, and go forward, trusting those notes to remind you where the problem areas are and what brilliant ideas you came up with to fix them, when you can do everything all at once, including new problems that will come as you go along.
I've done both, and find that #2 is probably the more time and energy-effective for me. You have to figure out which one works for you (but, knowing your penchant for worrying, I suspect #2 is going to get you to the finish line in better shape, and prepared to do a smashing final polish).