Just to give you a comparison how my friends daughter coped with working and having a dog, and this was an older rescue..
She arranged doggy day care to collect the dog about an hour after she went to work and the dog sitter then kept the dog with her for most of the day returning him home just before she got on. Unfortunately, the first day, even in that short time and having worked upwards in leaving the dog, her kitchen was ransacked and one chair destoyed.. so she introduced the crate which worked in part. The dog sitter was excellent in having the dog overnight and weekends if she had to go way on business for the evening. The downside with this is of course the huge cost on a daily basis and unfortunately for her, the dog started to take out his anxieties on the other dogs in the dog sitters care and the arrangement broke down. This of course, need not happen with your new pup, the comparison being a rescue of unknown background.
Young pups are going to have accidents, do get bored and frustrated and the best of them can chew your most cherished possession whether thats the remote for the TV, your mobile phone or the brand new leather settee. We lost plaster off the walls and the internet cables with one of ours. Your clothes will inevitably have hairs on and suddenly the washing machine isn't the same without clothes coming out hairy than they went in because you forgot and washed their blanket.
Cockers do need a fair ammount of grooming and even if you are going to pay a groomer to do the main work, you still need time in between to brush and keep knot free, especially in weather like now when they are often wet and muddy.
The plus side, as a single person in a stressful job, was the solemate she could come home to and take out to unwind after work. However, this means walking very early mornings and after dark in the winter, cold wet nights when all you want to do is sit in the warm with a nice meal and a drink.
Soooo, does that phase you or are you prepared for your life to be changed for the next 15+ years?
Definately the best decision we made, but I can understand how some will find it too hard and hence so many young dogs end up in rescue. Our first boy was homed twice before we found him at 9 months old.
Good Luck in your decision, whatever it might be. I'm sure your potential pups breeder would rather you took him with your eyes wide open than find you couldn't cope and the pup had to be returned x