Hello Keith.
Welcome to JustinGuitar and the Community. It’s great you have found Justin’s lessons, he offers structure and a sure path to follow from the very beginning. Thousands and thousands have learned using his lessons. If you need any help with a lesson specific question or with any general guitar learning question then do not hesitate to ask. Every lesson on the website has a video lesson, written content to supplement it, an orange click-button to take you to a Community topic for Q&As about the lesson etc.
There are many good folk here who will happily offer help and encouragement to those coming up behind them on Justin’s Beginner Courses. They embody and carry the pay-it-forward ethos we have nurtured for many years in our community. There are many old hands too who have years and (hopefully) a bit of wisdom they can bring as they give their support to those hitting the road blocks - which we all do.
Hopefully this tip topic I wrote will help you. Many people have issues when going from chord changes in isolation to chord changes at a tempo and in a consistent time when playing to a song or backing track.
Just ask if you need anything.
Cheers 
| Richard_close2u | JustinGuitar Official Guide, Approved Teacher & Community Moderator.