I've been playing double bass for almost five years now as I am about to start my sophomore year of high school. I've never seriously worked out of any method book(although I do own the Simandl first edition) and I've been wondering if I should begin to seriously work out of one, be it Simandl, Nanny, or any other serious method book. I know my way around the fingerboard very well for I have been including solos as a main part of my practice regimen(Bottesini's Elegy being my current one), along with scales, etudes, and various orchestral excerpts. My teacher rarely has me work directly out of the Simandl book and I'm wondering if I should start to. I understand this may be a question to ask either my teacher or another personal instructor, but any responses are appreciated.