First person present tense narration gives the sense of watching a stream of the hero's direct perception and experience as it is happening. It's a good choice if you want to show your reader what the hero is going through from that raw, unfiltered perspective.
It doesn't lend well to elements that wouldn't be part of the immediate moment:
- Passages summarising a development over a longer period of time (say, weeks) in broad strokes.
- Asides explaining things the hero knows in the back of their mind when there's no reason to focus on those things at the moment.
- Commentary from the narrator's older, more knowledgeable self. (A past tense first person narrator can say things like, "Boy, was I wrong." In present tense, they don't know they're wrong yet.)
- The narrator deciding not to reveal a detail. (You can still hide things from your reader by skipping a scene, like you do with uneventful periods such as brushing teeth in the morning, but that's basically your only tool.)
- Passages summarising a development over a longer period of time (say, weeks) in broad strokes.
- Asides explaining things the hero knows in the back of their mind when there's no reason to focus on those things at the moment.
- Commentary from the narrator's older, more knowledgeable self. (A past tense first person narrator can say things like, "Boy, was I wrong." In present tense, they don't know they're wrong yet.)
- The narrator deciding not to reveal a detail. (You can still hide things from your reader by skipping a scene, like you do with uneventful periods such as brushing teeth in the morning, but that's basically your only tool.)
What you need to do is the same as with any other form you write in -— decide well if the form fits the content, and then work in accordance with its nature and limitations.
