Spaniels are easy to work with, if they are working FOR YOU.
The moment you have lost it is when they decide to work for themselves.
Basic obedience is very easy when done correct.
The hardest part of spaniel training is teaching them to be steady to flush and hunt, once thats mastered you have cracked it (well 9 times out of 10). Once they learn how to run in it is very hard to reverse it, it's like their ultimate reward.
My advice is buy a good book and study it now(i would recomend spaniel training by joe irvine, you can have my copy if you want it, PM me), put in the founda