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I find collimating fairly easy these days. I collimate the secondary indoors in day light. Once it's done right, you shouldn't need to do it again, unless you give the scope a hard knock or something. I did my secondary collimation again just recently again though, after I made my sight-tube. The primary collimation I do indoors initially as well. Just fiddle with the primary collimation screws until the spider looks central in the primary looking down the focuser draw-tube. Then I take it out & do a star-test & finely adjust the primary until the criteria is met as under the rules of thumb for collimating using the star-test.
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