How do you stay focused and avoid distractions when working alone?

Answer 1

put myself in an environment where i have only what i need for work. no tv, no magazines or books etc. often i will allow music in the background. it is good to drown out external noises.
i also allow myself to take a break every hour or something like that so i know i have an opportunity to check email or call someone or get coffee etc. i definitely make sure my email is closed if i am working, otherwise it is too tempting to check everytime a new message comes in!

Answer 2

By knowing the alternative.