Only 35% of acros show clinical signs at diagnosis. Neko's only sign, I found out later, was a teary eye due to soft tissue growth blocking her eye duct. It wasn't until much later that she had any physical signs. Some will lose a bit of weight as they are unregulated. Also remember the high dose condition IAA that should be tested for.
As for how to get them regulated, knowing what conditions they have may allow you to be a bit more aggressive with dosing. And like every diabetic cat, you just give them the amount of insulin they need. Some people with high dose kitties switch to Levemir insulin, as the acid base of Lantus can sting some cats at higher doses.
This post has a lot of articles describing acromegaly and the symptoms. The recent articles by researchers at Royal Veterinary College contain the latest research.
http://www.felinediabetes.com/FDMB/threads/acromegaly-the-basics-hope-you-will-read-n-like.45324/
I can't help you with costs. There is the cost of the tests from MSU which is just part of the cost, then there is the blood draw and shipping which varies by location. I would ask the vet for an estimate.