i don't think any of the mini games you have to do in order to get the sigils are particularly difficult. wakka's and lulus are time consuming but not difficult. and u can find maps online for the butterfly minigame telling you wot to do. like this one :D:
http://www.uffsite.net/ff10/images/butterfly-game-3.jpg
the chocobo race isn't really difficult u just have to get lucky with where the balloons are. i got it on my 3rd attempt last time :D
