It is very important to keep the dog relaxed. Dogs' fear of the unknown and of being hurt is what makes it difficult to groom them easily. A soft reassuring and constant voice will help settle and calm the dog. As for all, but especially the deaf and blind dog, a soft gentle touch will help remove anxiety. Puppies may require little extra cuddling, while a panicked and aggressive dog may require restraint and a firm tone of voice before it realizes it will not get hurt.
Some medication can help in alleviating some of an aggressive dog's anxieties.
Your vet can prescribe some sedatives to help you groom your dog. On a personal note, I have found that dogs that have come to me for grooming and have been sedated, generally are harder to handle. While medication does relax them, I find that they are much quicker to startle and they panic even more, although they also settle just as quickly. Besides having a great deal of patience to groom a special-needs dog, you must have the time. Allow a great deal of extra time than it would take for doing a dog without any problems.