I would say it's very easy and it's very difficult to manage time. The truth is, you get to manage time 50% of the times, and time will manage you the remaining 50% of times.
When you are managing time, be the boss, say NO or say anything you want...
But when time is managing you, bend and wait for YOUR time to come, just hang on to the problem brother....
Okay, enough, let me be serious... I am not that experienced in managing time (that's what the recruiters are telling me, I mean my professional experience), but I was successfully able to do it than most of my co-workers and friends...
First, list out all the activities you would like to do (I don't mean brushing and bathing here):
For eg:
1) Go to Office
2) Come back in the evening and go to shopping or park or wherever
3) Watch your favorite TV show
4) Go and read something useful (for your next job or promotion

)
5) Go to bed and have sweet dreams
Of which some activities may be a daily task and some may be occasional. I mean, Item No. 1 (Go to Office) is 5 days in a week where as Item No. 5 is a daily task.
It's easy to maintain time when you prioritize the work, and you have to come back and reschedule it time and time again because may be your favorite TV show got over and you have to plan and fill that gap. It's all about killing time, enjoying today and planning for tomorrow.
You know better than anyone else, so keep these things in your mind and collect all the advises my fellow ranchers are going to give you and manage your time accordingly.
Hope this helps,
Srikanth