As with children, everyone you meet has advice for you when you have a puppy. As with the advice given to parents of children, the advice that is given to parents of furries is often well-meaning and useless.
At the end of the day, no one knows your puppy, kitty, cat, dog, son, daughter, lizard, bird, and household as you do. You deal with it every single day. You witness the ups and downs every single day. You get the feel of when to correct and when to be patient. You should follow the advice of professionals (as you should with children), but ultimately you are the leader of the pack and will make changes that your puppy requires.
Keep in mind advice is given for the average. Extremes are needed to make averages. It is also very possible your puppy, child, cat, etc. will conform to the standards in the books and it is equally possible she will buck the system and require all your creativity.
So… keep on, keeping on. You are the best mum or dad for your critter no matter what they say.