Small decisions are best left to our intuition. We have remarkably powerful decision making heuristics - and can make complex decisions with minimal energy.

But as you pointed out, confirmation bias skews our thinking so that we find the evidence to support the decision we most want. Therefore it is a really good idea to discuss the decision with someone who doesn't necessarily agree with us.

Another good tip is to decide, sleep over the night, then reassess the decision.

The 10-10-10 rule is good too; Will I feel good about this choice after 10 days, 10 months, and 10 years. If not, it's the wrong decision.