You will need the right size spanner wrench. One seal and one wiper.
Also inspect piston for pitting or scratches, as those are what hurt the seal 90% of the time, and will destroy new seals as well. Also a decent understanding of the trim system is needed when filling it back up, or you can burn it up.
Honestly i dont know what size spanner wrench it needs cuz i have the yamaha tool..
And ive never seen a spanner wrench at any auto parts store. I think you might have to get it off of a snap on truck.