Lighten up on yourself. Give yourself the freedom to write when the urge
strikes, and not write when you don't feel like it. That's one of the attractive
things about the popular conception of the writing life, right? So enjoy it!
If you've been sitting on an idea until you think you're good enough to do
it justice, do it now! You may be run over by a bus tomorrow. Even if you
aren't, by the time you think you're good enough, the passion for it will be
gone. Write it now! Write all your good ideas as quickly as you can after you
get them. Don't worry about getting more; they'll come faster and faster the
more you write. Before you know it, you'll be begging people to take them, like
a gardener with zucchini.
Use every spare moment to write something, even if it's just one sentence.
An extreme version of this: don't plan any official writing time; just use the
spare moments in your day--but use them all.
The basic idea is, however you need to do it, just do it. Get your butt in the chair and your hands on the keyboard and write. Here's the link: http://sfwa.org/writing/strategies.html