here is how I did it:
-updated my resume
-had a personal statement ready (wasn't the final draft at that time)
-had my disadvantaged applicant essay ready
-put all these in plastic folders along with information regarding how to submit your letters and the deadline
-shaved
-went to the professors' office hours and asked them nicely if they would be willing to write a letter for me
-some professionals weren't in my city so I emailed them and attached all the required documents
-I reminded them twice: 1 month before the deadline and 2 weeks before the deadline
-once the letter was received, I sent a thank you email