Hi,
First of all, do not take the route through N-35(KKH) entirely, it goes through Besham and is way way longer than the alternative route through Kaghan Naran. N-125. Use this rotue, a mix of KKH & N-125
Haripur > Abbottabad > Mansehra > Kaghan > Naran > Chillas > Gilgit > Hunza > Sost > Khunjera Pass
The problem of the Attaabad Lake is no more. There is a tunnel now.
Do not go to Khunjerab between 10 July - 15 August. Besides the general dangers of the route, the roads from Naran to Chillas will stop you from moving forward.
Also avoid going after 31st October because after that snowfalls start.