First, dedicate a block of time. Schedule yourself time to work on the project. During this time hold your calls, shut the cell phone off and try not to glance at your email. Focus only on the project for the block of time. This simple step is a major step forward in the right direction.
Find a coffee house to work at. Why? Working in your office means people coming in and out of your office, regardless if you blocked time as busy or not. And working at home allows too much of a temptation to do other things. The coffee house will be your dedicated 'project' place and there isn't much temptation to speak with coworkers or watch TV.
Finally, break the project into chunks. This will make the task less stressful. Don't try to accomplish everything in one day. You will be worried about deadlines and rush the project. Focus on the quality of your work and give yourself room for creativity or unexpected schedule interruptions.