When I have to make a mix, first thing I do is identify the different tracks that the client have sent to me, gathering takes and grouping instruments according to their role in the mix (rhythm section, bass, solo, decorations, etc. .. .) to achieve an agrupation of tracks.
I start working on the mix in mono, improving the sound instrument by instrument by applying compressors and equalizers to the tracks that need them. Broadly speaking, with compression I search a better integration of each instrument, and with equalization I remove unnecessary frequencies, conflicts between instruments and give personality to each one getting the better of them. I can apply these effects for separate and/or groups depending on the case and the number of instruments.
Following is applying reverb, if necessary, to give more dimension to the mix. Sooner or later I will also apply any special effects that are needed or requested by the client.
From there I make the final mix, in stereo, moving volumes and panning.
Throughout the process I can detect noises, things out of tempo or out of tune wich I will fix on the fly. It may also occur a problem that has no remedy, for which I will request a rerecording of the particular track. Or it may be that it is necessary to record an additional track for a more finished work. Even I can record it myself.
Once at this point I apply a mastering process, essentially to increase the overall volume. I do it in a way similar to what I explain in "How do I master", but with the advantage that I can intervene in the mix if I want to change anything.
The effects that I apply are all digital. A small sample of my mixing tools: