1st thing. to do is to see if all parts are in the light (led bezel etc) while trying to jam the battery into it as fast as i can.
2nd thing. turn it on. turn it off. turn on and off and on.
3rd thing. then test all modes it is supposed to have or not.
4th thing. check the extra parts and stuff in the box while the light is running on max. (heat issues)
5th thing. add lanyard or pocket clip etc.
6th thing. play with it.
7th thing. compare it to others: tint, beam, clicky feel, u.i. size&weight, knurlings etc.
8th thing. think why did i buy it, what do i need it for, will it replace something else in lineup and where wil i put it then.
9th thing. find use for it or hide it.