If you start off with something difficult, painful, or unwelcome in whatever way, you're less likely to continue because we tend to use that first experience of something to evaluate how the whole thing is going to be.
If you're starting off with the worst, you're setting yourself up for thinking that the whole thing is going to be terrible, of course you're not going to want to continue.
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I'm the opposite. I break a task down into parts, and the parts I hate most get done first. Then I reward myself with the parts I like.
@ScottSoCal Whatever works for you!