ya mixing is tough from start to finish.
i recently realized to that recording methods are equally as important to the mixing process. a lot of the times id stand to close to the mic and it would come out sounding muffled cause i was too close to the pop protector.
the area we got isnt treated, got concrete walls in a basement, but there is some foam shit around the top lol. def not professional. i think we got a Samson condenser mic, it works real dope. i seen a few pros using them in videos.
i dont know anyhting about protools, and i dont know much about the science behind mixing as far as frequencies and such. its mostly by ear for me. compressors helps to remove the unwanted spikes, cut out some of unwanted noise with the threshhold. i trying to venture in to a multiband compressor for better results but that will take a lot of time.
for a good base, work with a basic compressor, EQs and reverb with backing vocals (add the bulk of effects to the backing vocals). but Protools you can prolly get some dope VSTs that come with dope presets.
to me its all based on the ear. but to me it all starts with how you record