Hi im going into 1st yr life sci this year.
Does any1 has any tips about course registering or how to get the course i wanted?
Cause from what im hearing, it sounds really difficult to register for courses.

Not necessarily difficult to register for courses. Everything is on a first come first served basis. Popular courses will fill up quickly, so if you want a spot in one of those courses, make sure to try to be on as soon as you can register. If not, then keep checking periodically throughout the days afterwards, as people change their minds and switch courses

Can u log on MUGSI before 12:00 and then go on SOLAR rite at 12:00 when it opens?

You can, and a lot of people do try that actually. But that's somewhat difficult, since so many people are trying to do that at the same time, the site really slows down

There's a 45 minute limit in MUGSI so if you don't get into SOLAR within that time you have to log back into MUGSI again.

Starting at about 11:30 it gets full, 'cause everyone knows that "trick." Just try your best and hope that your courses aren't full (they don't necessarily have to be full, it's just first come first serve)