New guitar technique or new guitar? Make sure your guitar is comfortably playable!
Every guitar is different and needs to be played – i.e. your body has to get used to it.
Also choose the right neck thickness and width, body and weight. Some people have short fingers, smaller hands, less strength in the fingers. Take your time to find a suitable guitar, play a new guitar or get used to new techniques. During the rehearsal you have to ask the bass player to change instruments for fun. You’ll soon notice what I mean by that. Go to the music store and test ALL guitars until you get a comfortable feeling with the neck thickness, width, action (height between strings and frets), string thickness, weight of the guitar, body dimensions, etc.
Example: an acoustic guitar sounds wonderful, in particular large models. But feel free to grab a Gibson Jumbo, and you’ll understand why not everyone can play on it for half an hour. Make a clear distinction between a study guitar (a guitar that may not sound as good, but that fits perfectly in the hand, is less tiring and fits completely according to your physical profile) and a performing guitar (a guitar with the SOUND you need at that moment, such as a jumbo model, short and powerful but not to play for hours).