I had the same problem when i first started playing blitzball. i seriously thought i was horrible and had no real idea about recruiting when you play the luca goers for the first time. so obviusly i lost that game! i thought they were seriously cheating or something lol because sometimes both players would tackle me when i broke only to one person, but then i learned why that was happening, and now like they are saying its easy as heck. i dont even have jechts shot ( i dont think) unless its sphere shot ( which is a way cool thing for tidus to have) i dont even have wakka, when i checked his stats compared to who i do have, he sucked. i have koyou, linna, svounda, miyu and everyone else is original. i got rid of keepa and botta because they suck. good luck with blitzball and dont worry to much about techniques because if you recruit people after level 3, they have all of them learned. i have only had like 5 succesful tech copies in my whole "blitzball career" and i have won all but two games ( 1 loss, 1 tie).
good luck hope this helps!