Umm... Did you try reading the directions? Lol. I've owned three - the first was an Eddie Bauer and the last one and this was graco and I've never had any issues. Google is your friend :-)
Ive read the directions multiple times and it still is being a PITA! Making H attempt it now!
We did that together when I was still pregnant because my husband is the worst at reading instructions. He kept trying to do crap that didn't make sense and get frustrated. I would ask if that's what the directions said and he would say "no", well no freaking wonder that's not working. Ugh poor baby heard some words that night.
Re: PNP Changer/Bassinet
I got everything put together myself except the bassinet part. It was a bitch. I feel like they could have made it a little more user friendly!
So...no tips. lol Good luck though!