Consistency Builds Endurance
The people that can establish a doable routine can be consistent with training. Those that can maintain a consistent training plan about 80-percent of the time are going to be successful completing the race.
More: How to Be Consistent With Your Training
As you work your way towards completing your first triathlon, don't forget to have fun. Planning to complete a triathlon is a good way to build or maintain excellent fitness and enjoy a new sport. I suspect you'll meet some great new people too.
Have fun and enjoy the journey!
Sign up for a sprint triathlon.