Let me be clear: a lot of information in the aim training scene is subjective and may or may not improve your mechanics.
I am not an authority in the aim training scene however I believe I have a knack for spotting bullshit and will do my best not to further spread misinformation on the topic during our training.
This is what I will do:
Check in on the ergonomics of your setup. I am not a licensed professional however I have done some research to avoid as much damage from use as possible. If it hurts to play then we will not perform well. We also want to care about our health long term. I will also provide some stretches that have been shown to me by peers in the space.
Check in on our routine: How do you warmup? How much time do you spend per day training vs playing? How consistently do we do it?
Check in our gameplay: Do we have good gunfight hygiene? Do we get stressed? Do we rush our shots? Are we stiff and unable to move to make ourselves a harder target and aide our aim with movement?
Recommend a training routine: This will be dependent on the total hours you can put into the game daily as a whole. I will likely not recommend long aim training routines.
What I will not do: Recommend a sensitivity, tell you what DPI/mouse/equipment to use, correct you on your mouse grip, that your aim looks snappier at certain DPIs, to play on stretched res, to use raw acceleration etc... I find many of these topics to be subjective and not beneficial to discuss with you. It is what I would classify into the realm of bullshit or snake-oil.
Muscle memory in aim training does not seem to exist:
https://arxiv.org/abs/2203.12050 (one of the questions they tackle)
Hopefully by seeing the way I frame this description you will be aware of the type of session you will be getting.