how do I center the projector?

[richdmb]

Hi everyone,

i started on my build and am thinking about how to install my projector.
Can anyone give me some easy tips on how to accurately make sure my projector is mounted centered to my screen?
How much do I have to worry about it not being perfectly centered and squared?
Also, i am going to use the skyrail from allsportsystems, it has 6 screws to mount the track, and I feel like it would be easy to mount it offline.
I have no DIY experience with anything, so sorry if these are noobie level questions/concerns

[inorkuo]

use a plumb bob to make sure have the right spot on the ceiling.

[richdmb]

use a plumb bob to make sure have the right spot on the ceiling.

Cool. Thanks!