<< I was wondering if anyone here can give me some tips on how to do a good job
on feathering. I have a 4", 6", and 10" drywall knife, mud tray, etc. >>
All the previous tips are right on the mark. Let me add one more essential
item, namely low angle lighting. If you can light your working surface nearly
parallel (without the glare in your eyes, naturally) then all the little flaws
will be highlighted. If you do the job to minimize these flaws, the wall will
appear almost dead flat in normal room light. Makes an amazing difference and
the job goes way faster. Good luck.