Eternabond tape is the absolute easiest way to go. What I do is employ my lovely bride to hold the roll of tape and I pull one end to the back. I peel back the clear plastic and place the tape down and roll it in very well. Once I have about a 1' section tamped down really well I have the bride put the slightest bit of tension (not much though) so we can get the tape lined up straight. Then I simply pull about 5' of tape and use a roller to adhere it well. Move the ladder 5' forward and repeat until I get to the end. Takes about 5 minutes to go up and down the ladder and securely roll the tape and cut it.
5 minutes per side, less to do the front and rear cap. In less than a half hour from start to finish you have securely taped the edges of your roof and they won't leak. Vents and skylights are easier... but require you to either lean far over the roof or climb up on the roof to do it.
