Bless you buttercup ......1st a big
take a few deep breaths & take comfort from the fact that you are not a bad puppy mum
IMO, despite all your good homework, the reality of having 'a cute, cuddly, snuggly puppy isn't what you imagined it to be & you are probably in shock at this 'little monster' you are now the owner of.....................(not always!) but quite often this is normal!! The picture people have of adorable puppies, in reality is vary rare. They are ankle biting, needle sharp teethed, 'i only have selective hearing' little gremlins .......but they are babies & this is where you step in to teach them
( & like with real kids, it can take some time for them to learn what is acceptable behaviour & that which is not)
You sound exhausted at the moment but if you are able to stick with little Ollie, things will improve but he needs you to show/teach him how to become a member of your family. (over & over again if necessary)
He's so young yet, but soon you will be able to enrol in puppy classes & go on little walks & his attention will focus on new things & not just your limbs
This forum is superb for advice & I'm sure those more knowledgable than me, will come along with some excellent tips for you. Books are also excellent, as is the NET but also your vets may be able to offer immediate help (or know a dog trainer local to yourself who could give you advice.)
If you are able to, buttercup, stick with your little man because the joy he will give you (with all the hard work
) & your family over the years will reward you ten fold
Good luck & would love to hear how you get on