How to Stop Procrastinating: a simple Guide to Mastering Difficult Tasks and Breaking the Procrastination Habit

Practice #1: Say No as Early and Politely as Possible
Be up-front with people about their requests. If you know you can’t follow
through on a task, then be firm and tell them right away.
Honesty really 
is
the best policy here. Simply tell the person that you have
a few priority projects that require your full attention and you can’t afford
the distraction. Usually, most people will understand the need to focus on
the priority tasks.
Try to end the conversation on a positive note. If you can’t help the
person, recommend someone who can. If you know of a helpful resource,
offer that as an alternative. And if you think that you 
might 
grant the
request sometime in the future, then ask the person to follow up on a
specific date.
Saying no doesn’t make you a selfish person. It makes you someone who
clearly understands what’s important. By having clear goals, you don’t
allow the demands of others to distract you from completing important
projects.