I teach puppy classes and I live in an area where herding breeds are the most common (lots of ranch land). Yes, it's a puppy thing. But yes, training will help and you should not 'wait' for things to get better. It's likely to get harder before it gets better. People think 8-16 week old puppies are hard, until their puppies reach adolescence
Almost every puppy will nip or mouth people. How a person reacts within a few days of experiencing that behavior determines how much that behavior will continue. Most people start off with no treats, no bite rags on their person, and the first little nibbles are endearing. Or, the person is so smitten with the fact that they've just gotten a puppy that they just 'interact' with their hands and laugh at the crazy puppy antics. THAT is the habit forming right there. And it's no wonder when those people present toys LATER on, when human-nipping is habit, that the puppy goes for the hand over the toy all the time.
My coworker never had biting issues with her aussie/X puppy. My other co. never had biting issues with her BC/X puppy. My other co. isn't having issues with her shepherd/X puppy. My other co. doesn't have issues with his GSD/corgi puppy. I never had biting issues with my Dutch shepherd puppy. But we all are in a work environment where training information is heavily shared and we all help each other out. Teaching a puppy not to bite/jump is no secret:
1. Focus on teaching behaviors that you want every moment you are interacting with your puppy (examples: how to follow a lure, capturing sits and calm behavior, playing with appropriate toys, biting appropriate tugs or bite rags, handling exercises, obstacles, scent games, impulse control exercises, its yer choice, shaping, flirt pole, etc.)
2. Prevent unwanted behavior (puppy is physically not able to touch you when aren't interacting with the puppy... IF you have constant nipping issues. Of course your puppy can be around you if it is calm!). This means knowing when your pup is most nippy (first thing in the morning? after a walk? after a training session? and using the most management in those times).
3. Negative punishment when the puppy nips (play time ends, time out, etc.). But with steps 1 and 2, you might not even need step 3.
Which isn't to say, never just chill with your puppy or pet your puppy without being in training mode... But some puppies enjoy cuddling more than others. I've met puppies who melt in your lap and could stay there all day. My Dutch puppy, for the first few months and even sometimes now at 8 months, physically could not be touched without his mouth on something. He learned day 1 not to put his mouth on me... Because the day I met him at my breeder's house I had a treat pouch and two bite toys on me. I met him by shoving a toy into his mouth; that's how intent I was on starting him off with training. So if I was sitting on the floor with this 9 week old puppy just trying to 'be' with him, you could see his little conflicted self wanting to crawl into my lap and snuggle but at the same time his head was literally flailing around looking to grab the closest thing. I'm not over exaggerating - open mouth flailing, all the time. If my face, my hair, or my sleeves were in the way they were first hit. But I walked around with a bite rag in my pocket 99% of the time. And any time I touched him I had a treat in my other hand waiting to reward calm behavior. You know how long it took me before I could kiss him on the head or just pet him like a normal dog owner without him head flipping at me? Very long. But, I still stand by the fact that I never had any nipping or mouthing issues.