First off... GOOD LUCK getting any 4 month old puppy trained!!!
Any sort of behavior training really shouldn't start until they are 6 months old..they don't retain alot of information before that.. as for the poop... house potty training should be done by yourselves and not by a professional type trainer.. most professional trainers will do obiedience type training.. sit stay heel and unless you want to pay for a behavior trainer..they are just babys after all and its like you just had twins
I actually recommend visiting some dog training sites.. books.. and truely doing it yourselves..
Potty training pups is like potty training kids..well kinda.. take them out every hour on the hour to go potty.. reward them well for a job well done.. Whippets are pretty smart pups, they are very high energy dogs and need alot of room for running, they are sight hounds, so more then likely any movement they see they will be chasing it down by nature.. if you don't have a large yard.. I really really recomend starting them out early at the local dog park..
Good luck.. and congratulations
Now where are the pics??