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Well, my dog didn't know what hit her when he arrived. It was like boot camp for dogs, lol.
But I tell you, in the space of 2 weeks of teaching me how to train my dog, I was already seeing great results.
Especially if you have a little horror of a dog on your hands which clearly shows that she is this way because you let her get this way which in turn shows that you don't know what the hell you are doing as a dog owner.
Don't take offence to that because I was exactly the same way. I have a 5 year old jack russell and when she was 3 she turned into a little nightmare and it was because I let her get that way. I had no idea what was going on. All I knew was that she was fighting all the time with my older dog and I had to do something to put a stop to it. Turned out to be the typical dominance issue thing with my younger dog wanting to take over the household and then the world no doubt.
I got a trainer in who was excellent. He moved to Australia from America where I think he used to train police dogs and he spent a good time with me on the phone before I employed him to come and train my dog. He is also a dog behaviourist and I tell you, any question I threw at him he could answer and explain and advise on.
I saw him about 3 or 4 times but to this day I say every cent was worth having harmony in my home. It was either that or I was thinking of putting my dog on medication or getting rid of her. I'm so glad I took the responsibility to fix the problem in the right way. My little dog has turned from complete monster to very well behaved, loyal and obedient little angel. She still has her moments but she knows who's boss in the house and it definitely isn't her.
Go for it, do your research, get references, try to get someone who has behaviour as well as training experience and you should be okay.