I mostly dont wanna use livesplit if i dont do good the first time around. Anyone know how to reset the timer?

The timer is reset whenever you leave and rejoin the game, but you don't have to do that everytime because it's not used for timing (it's not very accurate).

Not using Livesplit isn't a problem either, just record your gameplay in an acceptable quality and you should be fine as the mods will retime your run anyway. If you want to make it easier for them, reset the IL Timer (the one right below the gem counter) on Level 1 before you start a new run.

Now the timer for the level matters so I would just complete the level (if bugged) or I would just go to level select and select the same level I'm on (also used for the death fling glitch which I believe is patched in the most current version.