Well said Doug_12-String!

I would also add that choosing the right combination of long term and short term practice goals go a long way in keeping you motivated.

For example :

Long Term Goal - learn to play this song I love
Short Term Goal - learn the strumming pattern used in the verse section

Using your practice sessions for smaller, broken-down tasks will sharpen your focus. The short term goals are often achieved quicker, and you will feel rewarded from the hard work and practice you've put in, motivating you to keep moving towards your long term goal!

Cheers!
Mike