How do you build your kits?

I guess Im sorta old school , I do a bunch of painting right on the sprues , then assemble , touch up and weather .

Mine goes like this:  Glue, put in box while building up the courage to paint, forget, leave in box.....

Yes, it depends on the modeler AND the model kit too. So, an algorithm can go like this:

Clean parts while on the sprue in a bath of de-natured alcohol >>

Dry-fit to check for necessary filing, putty or warpage >>

If warped, then straighten this out >>

Look ahead over I-Sheets thoroughly >>

Then start gluing in subassemblies >> 

Look ahead over I-Sheets thoroughly >> 

glue more subassemblies if appropriate >> 

Assemble subassemblies leaving the turret, road wheels and tracks off (if a tracked vehicle), wheels/tires assemblies off if a wheeled vehicle >>

Prime >>

Paint >>

some weathering overall including road wheels and tracks which are still separate >>

(gloss coat for decals sometimes if needed) >>

decals >>

(flat coat over decals if needed) >>

assemble/ glue the road wheels and tracks on >>

more weathering >>

then going back and removing some weathering because I'll have done too much somewhere >>

build (except for mirrors and tools), prime,  paint, add track, add tools and mirrors, maybe mist the base coat over the camo to tone it down, washes, (OOPS forgot the decals again) decals, maybe some powders or misting, build base.

I don't shoot varnish over pigments/mud effects,it diminishes the effect.Also I leave roadwheels and tracks off the armor and paint and weather of the vehicle.On the other hand I attach the tools and acessories and spray the basecoat and then hand paint them while on the vehicle.

Everyone has variations.

Build major sub-assemblies (upper/lower hull, turret) -> prime -> paint -> combine major sub-assemblies -> gloss coat -> decals -> gloss coat -> wash -> dull coat

That's just me though.  Every builder has his own style.