Take one measure from your current piece (e.g., Lagrima by Tarrega). Isolate the scale or arpeggio from your PDF and apply the same fingering. This is where technique becomes music.
You do not need to spend $50 on a method book. The classical guitar world is generous with public domain resources. However, beware of low-resolution scans. Here are the top three sources for high-quality, free PDFs: Take one measure from your current piece (e
Even with the best PDF, students fail. Here is why: students fail. Here is why: