What I learned recently is: Protect your muse! She is an elusive and slippery beast and you have to entice her with everything you've got, namely, find the conditions that yield successful writing--and then use them. For me, a certain geographic location with minimal distractions, a comfortable desk and chair, a certain time of day, and background music all collaborate to get my creative juices flowing. There are other things I could be doing this time of day...but I've learned I should not. I'm not nearly as successful in other conditions. :(
That's my tip for wrangling a muse. What's yours?