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The most important trick is to keep an eye on the reservoir to make sure it doesn't overflow when you push the pistons back in the caliper.
It's best to open the bleeder, attach a hose and let the old fluid drain into a pan when you push back the pistons. Tiny bits of seal and oxidized metal can be removed this way. Remember, brake fluid is hydrophilic, that is, it attracts and holds water. It's actually a good practice to change the fluid whenever you change pads. If you have someone to help it's easy to close it off before any air gets in the line, though I do it myself with no problems.
Contra todo mal, mezcal; contra todo bien, también
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