I've just looked at the photo you posted of him quite recently and he definitely has hairy legs, but quite a smooth head, and quite silky looking, so you might find he naturally has a silky and quite fine coat, which will be easier to look after than a thick and woolly one. What does the coat on his body look like?
At 8 months he still has his puppy coat but his adult coat might be coming through. If it is you'll find a lot of coat coming out when you brush him.
Do you know what you want him look like? Lots of groomers sadly assume that every Cocker owner wants their dog clipped short all over, so probably the best thing for you is to look at some pictures and decide the look that you want and that's going to be practical for you and your family. Then find yourself a groomer, visit before the appointment and take the picture with you and discuss options.
If he still has lots of puppy coat that isn't ready to come out you might get away with him just having a bath and having his paws trimmed for the time being.