How can I proof-read my own work more effectively?
From Google: 

Proof-read:


from hard-copy
backwards
aloud
a few days after the last revision
after revising the text for clarity and brevity
line by line, covering the remainder
double-checking small words ("if") and proper names
looking for one type of mistake at a time
looking for mistakes and idiosyncrasies to which you are prone (using the search function or even more sophisticated).


Helpful links:


Proofreading and editing tips
Top 10 Proofreading Tips
"Proofreading", from The Writer's Handbook


On motivation:


schedule enough time to divide the task into small chunks and take breaks
reward yourself after completion of each chunk
listen to music
have a nice cup of tea
you have the soon-to-be published result of your hard work in front of you. Indulge in some pride as you go through the paper.