Last.

Do you brush your hair after or before you put your clothes on?

after xD even if i do it before, i still end up doing it again after xP

which hand do you use to eat, left or right?

Right, 95% of the time.

Do you put your socks on before or after jeans ?

before, that way I don't have to fight with the ends of the pant-legs xD

do you usually eat dinner before or after 6:00 pm?

Usually lately it's been after... last night wasn't until 11 pm...

Is your soap on the right or left of the faucet ?

on the right :)

do you wear your watch on your right wrist, or on the left?

I haven't worn a watch in years, but when I did, left wrist.

Do you put on pajama bottoms before or after your pajama top ?

after, I put the top on first ;D

do you have the toilet paper on the right or left hand side of your toilet?

Sitting or standing ?

Sitting, it's on the left here.

When you open your front door, is the knob/latch on the left or right outside ?

Right. My brother's Webster's Pocket Reference Library collection.

If you keep a lamp in your room, Do you keep it to the left or the right of your bed?

To the right or else all the light escapes through my windows :P

Do you pick the dirt out from under your nails before you clip/file them or after?

before

do you do you put shampoo in your hair before or after getting your hair wet?

after

Do you check your email before or after getting on Subeta?