Welcome in winryember!

It must be really frustrating to have a musical idea in your head that you know you can express on other instruments but not on guitar! Having experience on another stringed instrument (cello) I imagine your learning curve will be fast. You probably have a good understanding of musical theory, which in many cases a weak point for us guitarists :).

We've all been through ruts here...hope you find the help you need here! It's helped me in the past.