help with using salon colors!

my friend is a trained hairdresser, & i told her i wanted to dye my murky browny/natural red hair to a dark coppery red brown color. she recomended the company matrix to me, and the shade medium copper golden brown, its the *exact* shade i want. she has recomended that i used a 20 or 30 developer and get three tubes of this shade (im doing my light brown clip in extensions too!) i was just wondering, how straight foward is this to carry out myself - shes living with her boyfriend up north for the next six months so she cant come down to do it for me, but assures me it is fairly straight foward to do, thanks in advance ! x

listen, it is easy easy....mix it up apply to hair and you're beautiful.....what i do is put it in a bottle with an angled spout thing and just saturate my hair.....process and presto!!!  matrix is the #1 color in the world....the only problem you could run into is if your ends are pourous or damaged....just wait until the last 20 min or so to do the ends....you'll be fine.  tell us how it turned out!!