OK, first off, never follow youtube videos! They are more often then not very wrong, and can cause a LOT of harm of not correctly executed. You say you have the homebrew channel already, and that's very good, on a 4.3 system, that's the hard part. Follow EVERY step in THIS guide and you should be golden. Make a post soon in the INTRODUCTION section to receive many helpful links for guides that you may want to use after.