OP, I am sorry if we made you worry and feel a bit bad about that.
Battendog is a springer because, in my eyes, springers are the very best of dogs. If true to breed your dog will be friendly, playful, funny, very cuddly and always 'up for' a walk. Battendog is lying behind me soggy from his morning run. He looks fast asleep and worn out but I am certain that if I grabbed his lead he'd be up and ready to go in a second.
However, the fact that I love the breed doesn't make me blind to it's problems and I honestly think the best way to choose a dog is to be realistic about the challenges that particular dog might bring. Battendog is a show strain springer so, in theory, is calmer and less energetic than his working cousins. Despite that, I still recognise many of the same challenges and the article I linked to, while extreme, still contained enough truth for me to read it nodding my head while thinking of my dog.
He needs stimulation. The minimum is two good, off lead walks per day (1 hour- ish) where he can run about. He does better if we also throw in play times, training times and grooming time in the day too. That's 3-4 hours day total where he is my sole focus. Outside of those times, he is sociable and wants to be with people so is involved in almost everything I am doing. Gardening? Battendog is running around with a plant pot in his mouth. Pegging out the washing? Battendog is trying to steal socks. Ironing Battendog has curled up under the board. Cleaning the car? Battendog is trying to catch the hose water.
That's a lot of time to dedicate to a dog and not everyone wants to do that.
Normal training classes may be fine but I concur that some (many?) trainers don't understand spaniels especially well. That said, I have recently found an excellent trainer (fourth time lucky) who doesn't have extensive spaniel experience but is brilliant at really watching and understanding each dog. That has meant she is able to really study Battendog and give me tips. For example, more than any other trainer, she has understood his need for novelty. I cannot ask him to do the same thing 5 times and give him the same reinforcer. It is not rewarding to him after the 2nd or 3rd time, no matter what it is and food is hardly ever rewarding enough in a distracting environment for him. Instead, last night at class, we rewarded him with a new toy, a different toy, food, the chance to run over and A-frame, a game of chase-me. It makes it hard work for me and I sometimes look longingly at the other dogs in the class who are very food-motivated because they are so easy to focus. But that's not the dog I have.
I do think a love of walking helps with a springer. You mention that you wanted a dog to get you walking? I am really hoping that's because you genuinely love walking but would enjoy it more with a companion. Otherwise, a winter filled with mud and rain followed by a summer of picking grass seeds out of her ears after every walk can become very tedious. Walking isn't the only thing, though. Many springers love sports such as agility so when she's old enough you may find something like that suits you both better?
If you really think this is not the dog for you then now is the time to decide it - before you get her. However, if you go for it keep in mind that the first year or so is the hardest so brace yourself and know that you are not alone. Plenty of us here have faced spaniel-typical challenges and can talk about what has worked for us.