OR...you can put in a bunch of "blind swaps" and be done with it. That way you never have to look at it until you can get to a computer, and hope for the best.
There are several pages of trip qualifiers you should fill out, so you -hopefully- don't screw yourself too badly.
Or, do what the F/A's do, pay the Portland Mafia $1,500 to sit on the computer all day and put in your swaps...(that's what I was told, by a 15,000+ seniority F/A who was on a super senior trip!)
The "others" were not happy about her being there, I can tell you that!