You don't want to have a "Panic Attack" if you can't sing high like James Labrie or anyone else
In Ken Tamplin's five laws of singing, the last law is to understand the Pyschology of singing. If you are afraid when it comes to hitting the high note, think about the note itself and use you head voice to hit it. You also have to remember not to sing so heavy at the bottom so that you can hit the higher notes at the top of your register. This can definitely be useful if you are singing "Dream On" by Aerosmith. Also works well if you are covering Rush Tunes like "Tom Sawyer" and "Free Will."