- That guitar/amp/pedal you are lusting after and just know it is the best possible choice in the world, even though you know nothing about guitars/amps/pedals... Well, it is very likely you will find out that is wasn't all that, after you purchase it. (take online reviews and demo's with a grain of salt, too) Don't be taken in by a dumb or too slick sales person at the store.
- Learning guitar will take plenty of time, patience, and dedication. It will take years to sound like what you really want to, if you have the talent and dedication. Don't expect too much right away, but don't let this advice turn you away. You will enjoy the journey and be surprised just how good you can sound fairly soon. *This doesn't apply much to prodigies, however.
There are many exceptions to the above.
This became more advice to new players than stuff I wish I knew. I'll add more later...