BE CAREFUL. Hot peppers can be dangerous. When cutting up jalapeños or habaneros, or other hot peppers, use caution. If you have open cuts, wear gloves. If you want to de-seed them, do so, but do not do so under water or near running water. The vapors from the pepper will mix with the water vapor, and they may cause a sore throat and coughing.
Also, don’t forget to THOROUGHLY wash your hands and arms after cooking with hot peppers. That stuff sticks to you like you wouldn’t believe, and is very painful to get anywhere sensitive (eyes, nose, mouth, etc).
This doesn’t apply to bell peppers, as they aren’t on the same level as jalapeños and such.