As per the link above the initial steps calibration is pretty straight forward.
Once youve done those you need to work through the calibration print objects to fine tune.
It may sound daunting but you can do it on your own if you take your time and read the documentation.
Change one thing at a time and test before moving on to the next.
Ive just been through it and now have a reasonably good print quality.
But it doesnt stop there you will be continually refining it as you learn more about the process.
And it seems the machines dont stay tuned.
As things wear, you change your filament or you move your machine from one environment to another. You will be fine tuning.
Gordon