1. See life as easy; see challenges as surmountable.
Every complicated or difficult thing can be broken down to a very simple, albeit very long, chain of steps.
"The journey of a thousand miles begins with a single step."—Lao Tzu
So take it step by step.
And if you don't know what your first step is, write down what you want to do and work backwards how to get there. Your brain will help you figure out the first step from there.
2. Pair music to what you are doing to be able to keep doing it. It puts you in the mindset for whatever you're doing.
Video game music works for creative projects; energetic music works for any sort of energetic activity.
3. If you lost someone, keeping a routine can help you heal. Fill that routine with positive things that will help you. Action inspires habit, which creates the routine.
Those are just some things off the top of my head. There's also a thread by Quiet1 with stuff that may help: