O2 sensor how hard is it to replace?

not to bad.spray it down with pb blaster before you try and remove it,let it soak a while.there is an 02 slotted socket wrench set you can rent at autozone for $30.00,part# 27110,or part# 27162 for $25.00.you may need a 3/8" drive ratchet,and a 1/2" drive ratchet.on your car i think you have only 2 sensors,upstream.one on the left and one on the right.both are the same part#...when finished,return the tool set to autozone,you get all your money back.

EASY IF YOU HAVE A LIFT