Is it difficult to navigate through Pudong Airport? my first time in airport .. any tips ..

No, it is quite easy.
First of all, you have enough time to make this transfer. Don't worry.
Upon landing at PVG, you need to confirm your onward boarding pass at Q Area. Next, go to Check in (R Area), and accept quarantine inspection, immigration inspection, and security check. Then, go to international concourse, and wait for boarding.
In addition, the airline staff will help you handle the transfer. There are also many clear English signs for your convenience. :)