Go Ahead - Break the "Rules"
Maybe you're hung-up on which way to go with a few of the following:
For example, you're in a bad mood, and your character just discovered the love of their life. You wouldn't want your mood injected into the scene.
However, in general I don't see any problem with making your character somewhat of a reflection of yourself. In fact, I believe it's bound to happen. Just make sure to give them individuality.
Lance Bingham smiled. Those feds thought they were so intelligent by screening his mail but they didn’t know he had the perfect system worked out. They likely never would figure it out and that was why he was really the one in charge of the investigation. They only found what he left for them to.
Zachery tracked the cord from the video camera to where it went through a hole cut out in the drywall.
Paige kept her eyes on the place where she had fired her weapon and a hand instinctively went to her replacement firearm. Standard protocol dictated that when a weapon was fired it was to be collected as evidence.
Something about even hearing it referred to that way made Paige regret the decision.