One idea, or rather analogy, that helped me as a practicing musician over the years was one of a piggy bank. But, not one you put money in, but one that holds the currency of guitar practice.
Whenever I practice guitar I imagine depositing practice currency into the piggy bank. When you practice a lot, you deposit a lot of currency into it.
You see, once you start gigging a lot, playing professionally even, you will be doing a lot of travelling to gigs or shows. If not travelling, you’ll be doing other tasks that will allow you to do music.
When you are not able to practice, you can imagine yourself taking out some of the practice currency. This sounds imaginary, but being a musician works very much like that.
When flying to other continents and generally being in a band, you sometimes spend more time at the airports or vans than with the guitar in your hand. This is why its important to have the practice curency in the bank because you will need to draw on it. But, in order for it to carry you, it must be there first. Thinking in above terms can also be a very motivating factor to play your instrument more.
It’s a simple idea, but one that has helped me in the past as much as it helps me today.