when should I put together ?

I have this for my son, he's due July 23rd & in currently 35w3days . This is going in our bedroom for during the day use or etc, so I was just wondering when would be a good time to put this together ? I know once I hit 37w I can basically go into labor at anytime, so I was just wondering should I put it together at 37w ? Or wait until later ? I just don't want to have to do it after I have him, saves me the hassle especially if I struggle ( because my fiancé & I are both horrible with directions & end up arguing when we do it together lol! ) . & like I said I never know when I could go in . What do you guys think ? & if you've had a similar setup,when'd you assemble yours ?