I installed a overhead storage shelf made by Hyloft (see item here:
We did it with careful measuring. I thought later we should have just made a template out of cardboard and just done it that way. The brackets have to line up on a joist. The job was way too long for what should have been a 20 minute deal.
Like to do it again, buy since my brother is leaving to go home this weekend, it will have to be a solo effort.
MJ