It just takes some practice. Tinning the tip is just basically tapping the tip with solder so that there's a little bit on it to start.
Sometimes people will hate soldering because they're doing things like soldering on headers or something small while using an iron that isn't powerful enough, or using too much solder. Or some are like my friend and try to mod an amp with a plumbing iron and then I have to fix it.
You'll get it, it's not hard.
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