Some great tips here. I'd like to add that if you're using more than a couple pounds of force to remove body work you're doing something wrong.
Not losing your cool with bodywork (and motorcycles in general) is vital. A lot of people don't have much patience and aren't trained resulting in forgetting that motorcycles are engineered not crow bared into existence. With motorcycles, turning to more power and force will put you in the hurt locker pretty quickly with broken bolts, stripped threads, and broken risers etc. If a piece of bodywork doesn't come off with any more force than you'd lift a baby, then there's something you're not understanding about how it works.
1) STOP!
2) Take a break - walk away from the bike for a few minutes, lunch break, or even the next day
3) Come back refreshed - refer to the service manual, and try to figure out what you're missing. Keep in mind as good as tutorials often are, sometimes a tiny step is missed or some potential issue still remains unclear. Maybe some step was easy for the tutorial writer, but not easy for you. That's why I prefer the service manual - the information is always there in a somewhat standard format. It's a matter of understanding it. Also the more in tune you are with the service manual, the more successful you will be when you need to do things tutorials aren't available for.
When I worked on my bike this year, I followed the service manual procedures to remove most of the bodywork (most as in amount of bodywork, I always followed the service manual). I followed these 3 steps when my frustration was increasing and I found myself using what was nearing too much force for what needed done.