Buffing?

use a sanding block,i use paint mixing sticks cut to about 5 inches long,the width of half a sheet of sand paper.Fold the sand paper around the paint stick/free$$$ block,that you have eye balled to be sure is flat and straight,and with plenty of water,go to sanding .I would recommend for beginners,1200 grit 3m wet/dry,followed by 2000 3m wet/dry.Ive been doing this for over 20 years,so i start with 800 grit,followed by 1500,then 2000 or 2500.Any ways,i sand front to back in a 45 degree angle,then reverse the angle(to make kind of an x with the scratches)and go from rear to front.I personally sand one panel at a time,all the way,and then buff.Paint starts to repair it self kind of,because the solvents in the paint evaporate.If you sand the whole car before you start buffing,were you start at might buff easy,but by the time you go for a while,you will find the paint seems to get harder to get the same grit scratches out as it did a while ago.Im sure there are other "pros" that will say different,but ive done 99% show cars in my 20 plus years of work,i know what im talking about.Oh yea,once you have sanded one panel,dry it off and you will see all the imperfections like crazy.That paint that you think isnt very textured will surprise you once you hit it with sand paper and the sanding block.Dont use the sandpaper without the block,or youll hace funny looking finger marks in the paint.