In my ecperience with my two(witch mind very well) training was easy.
i got lucky…. my friend who saw how easily mine learned got a male and he had me train him.. well i realized veryfast i just got lucky.
but after a week of 30 min a day of continuos training he got better. i find that being firm in your command. and not rewarding at all when command isnt done made a large difference.
Example i said sit and said it firm. dog sat and he recieved treat and happy reaction. did this while i held treat at my chin level so he could see but not reach it. when he did not sit i put treat in pocket and walked away. when he followed i let him smell treat and repeated command firmly, he sat i gave treats and lots of love worked well. some pits are very hyper and need more time like childern, dont give up