#1
I did a cover of Guns N' Roses Nightrain, up until the second solo which i have yet to learn its on my profile so check it out and give me some feedback on what i can improve/change, but remember i have terrible recording equipment atm.
#2
First of all, using Audacity, remove, (delete or generate silence) for that first feedbacky part in the start, it wont affect your playing but will make for a better recording.

Before that you can sample the noise and remove the noise from the rest of the song with the "Remove Noise" option in Audacity, remember to put it on less.

On the verse, your playing parts wrong, check the tab, theres a few notes your missing, and on the pre-chorus the palm muted part should have your fingers on the 3rd fret of the Low E string, and the 5th fret of the A string.

The Chorus wasnt bad, and the first solo was nearly perfect just work on the start.