Yes, it does take time to get to know 3D printing i general and also the characteristics of your own machine. But if you stick at it, you'll get it.
I always print in ABS, but it should print fine with PLA. It takes a little time to get to know your machine. I also used to calibrate a lot. Now I only do it maybe every 6 months.
There is a very good guide on a lot of different printing problems here:
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https://www.simplify3d.com/support/p...oubleshooting/
Make sure you print the boom cylinder mounts laying on the side (like a donut) and with the smaller opening down (so that you don't get any overhangs).
If it is sroopy / slopy, then maybe the temperature is a bit high or you are extruding too much plastic? Have a look at the guide and see what problem matches your problem the best.
If you still have problems printing the thin walls of the part, then just download the Fusion 360 file and push out the walls maybe 0.5mm on each side to get thicker walls. The part should still fit fine. Then select and save as .stl and retry the print.
Best regards,
Stein :-)