BMW tint - after purchase

Does anyone have any advice on tinting the windows of my X5? It didn't have tint and it's the only thing I wish it had.

I have a 2004 X5 that came with the factory tint on the rear windows. These just wern't dark enough for me so I just simply took it to a WELL-RECOMMENDED guy that did window tints and had it done. Now I have 35% on the front and about 3% on the rest. It's black so it looks REALLY good. I would just recommend taking it to a trusted tint shop and have them do it.