Default downgrade from 4.3 to 4.2.2 ??

i was so super happy with my phone when i was on 4.2.2. since the upgrade, i have been experienceing wi-fi connection issues that have been driving me crazy. i have tried everything i know. at this point, i just want to revert back to 4.2.2.

can someone please tell me if this is possible and if so......in nooby terms how do i do it ?

i'm certain i must be rooted which i plan on doing asap !