There are so many wrong points in your post.
1) The UN never passed any resolution on Kashmir until after the 1947-48 war was over, so an Indian would not have been against any official UN position at the time.
2) The Indian Army in 1948 consisted almost entirely of highly trained combat veterans, both in terms of its enlisted men, and in terms of the British and Indian officers who led it. It was, if anything, much more combat-proven and capable than any Indian army since as it still adhered completely to the British military doctrine that had brought it victory after victory in World War 2 against Japan. While Pakistan's soldiers were similarlt experienced and led, they were grossly outnumbered.
3) Aside from numbers, in 1948 Pakistan's army shape was terrible. It lacked both equipment, as many of the tanks, artillery, ammunition and supplies it had been allocated to receive on paper remained stuck in former British bases in India, which refused to hand them over.
While you might present some historical facts correctly, your post is quite misleading.
Are you denying that coward Gracey's defiance of Quaid-e-Azam's orders to send in the regular troops? The initial incursions were done by Pakhtun tribesman, Potwari Azad Kashmiris, and irregular Pakistani military men. Yet we still extracted 1/3 of Kashmir. By the way, I'd like to see some non-biased sources chronicle the tribesman looting and pillage along the way? It's a bloody libelous that many so called Pakistanis accept this as fact. Where were the rest of Pakistani sherdils when it came crunch time?
Let's not forget the role of the coureagous Gilgit scouts that knocked out the Maharajah military in what is now Northern Areas. The Kashmiri Dogra (Hindu, Sikh, and Muslim) army was NO match for the Pro-Pakistani forces.
Every student of Pakistani Geopolitics knows that Pakistan could have choked the Indian advances as our Muzzaferabad-Srinagar and Sialkot-Jammu access was still better than the Indian Gurdaspur-Jammu access (which never should have been Inidan territory in the Radcliffe award, but I digress). Perhaps we would have lost the Hindu majority Jammu districts closer to what was then India, but no way would the Valley have been lost.
Regardless of the excuses you make about Indian superiority or lack Pakistani munitions the point is that is that we never fielded a true military in that region. If we had at least made the correct attempt to take on the state, there wouldn't be a Kashmir issue.