1) Make a list. It does not have to be perfect. Just get started.
2) Divide it into 2 lists, need to do and fun to do
3) Order list in terms of importance, both lists
4)Pick one in need-to-do list and plan on how you will accomplish
5) Once 4 is done pick an item from the fun to-do list and once done go to 4 and start again.
6) Continue until done
Note: Review and reorder the list every 2 months or whatever period you pick. Make sure to follow the order. It's easy to skip what you really don't want to do.
The hardest part is getting started. Once you start to see accomplishments it will motivate you to continue.
Keeping the list in your mind does not work. It just gives you an excuse not to start. Also trying to accomplish everything as fast as possible will just force you to quit when it gets too difficult. Set a pace you can follow.
We tend to overestimate how much we can get done in a week but underestimate what we can do in dozens of weeks. We overestimate what we can accomplish in a year but underestimate what we can accomplish in 10 years.