I has been taking lessons for more than a year. One hour with a teacher every week and 1 hours daily practice on my own
I can comment on the prospect of beginning these lessons from their respective beginning point or moving to the more advanced 2nd lesson.
I have been practicing guitar for 6 years mostly from the perspective of steel string flat-picking with some finger picking using chords. I also learned a good bit of music theory with playing of scales but was not at all conversant at reading music. The Delcamp lessons begin at an early enough level that you can begin as a novice and learn not just to play the assigned pieces but also the fundamentals of classical guitar technique. This means learning how to maintain proper posture, hand position and of course how to excite notes as well as rests and the more demanding damping technique for string motion. If your experience is limited to one year of classical guitar study you will have come a long way. You may be a candidate for beginning at the 2nd lesson but you will certainly learn from beginning at the 1st lesson. I also believe that a lot of the people in this lesson series reapply their focus on earlier lessons and may be taking more than one lesson series at a time.
At any rate, good luck on your classical guitar pursuits.
1972 Morris No. 12
1973 Ryoji Matsuoka, No. 20
1979 Yamaha C300
2014 Sakurai Kohno Pro-J
Martin Guitars (MC28, D12-28, J40)
National Resonator Guitar
Les Paul 1960 reissue