If nothing else, start punching paper at 100yards. Any trigger time is good trigger time.
Do you have a range finder? And are you hand loading?
You can definitely do it solo and be self taught - just need to start slow.
Once you have established your zero and are confident in that shoot some groups further out. Don't touch your scope, just make sure you have a tall enough target to catch your shots. Not talking steel here, punch holes in something and use your zero hold on the same aiming point. Now you're shooting some "drops" and collecting data.
Eventually, at 500 hundred or so, (on a four or five foot tall target) aim for zero and shoot a handful of shots. Measure that drop (distance from point of aim, to average point of impact) and compare it to a trajectory out put in your ballistics calculator. For instance, if your group prints at 35 inches under POA, cross reference that 35 inches and adjust your velocity input until your computer dope output matches up. If you have a chronograph you should be able to get close on your inputs.
That's a start, shoot a LOT at 100 to 500 and strive for consistency. Run hypothetical numbers through you calculator and it will start to make sense. Experiment with the different data inputs and how they affect your trajectory - environmental and velocity (don't monkey with BC if you have a bullet selected with a known BC. )
Shoot a lot!
There are many on here far more advanced than myself. This is just how I wish I would have started out. Consistency in everything you do is the key.
Shoot A LOT!!