biggest mistake I used to make was putting too much of the tyre onto the rim before attempting to get the last bit on. When you pop the last bit onto the rim, it has to stretch a bit. The smaller that last bit is, the less it'll stretch making it harder. 6-8" remaining is about the time to lever the last section of tyre on.
Taking a break seems to work too. Struggled with a TKC80 for ages. After 15 minutes doing something else it popped on first attempt.
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