Assembling your models is an easy enough task, despite the fact that you have to glue so many arms and legs together! You simply need to take things one step at a time.

 
Free all the various bitz from the sprue with clippers. It's a good idea to organize the many items into separate piles (you can put them in old jars to avoid losing bitz). This step will make the actual assembly a bit easier.
 
Trim the flash from the models with a hobby knife. Flash is a thin line of raised plastic left from the molding process that is clearly visible on the model. Use a scraping motion to remove the flash.

 
Separate the bodies and legs from your piles of plastic bitz and glue them to the bases before attaching any arms.
 
If you wish to see a model's pose before committing any glue, use Blu-Tac or the blue strip from some epoxy putty to secure the bitz temporarily.

 
Add heads, weapons, and the like to complete your models.
 
Make sure your models form - up neatly.

Before you move on to painting your models, it's probably best to get a few things out of the way – mainly texturing your bases and priming models for painting. Texturing a model's base is best done before priming. This way, the glue and primer act as sealants and ensure that none of the sand falls off.

 
Spread some white or wood glue onto a model's base and dip it into a container of sand. Shake off any excess sand and set the model aside so the glue can dry.
 
White or Chaos Black Spray Primer makes much more sense when undercoating a large unit of 20 models. Be sure to follow the instructions on the spray can if you use it. But if you wish to prime your models by hand instead, go right ahead!

Armies of the Warhammer 40,000 Universe
Black Templars
Dark Angels Orks
Catachans
Dark Eldar Space Marines
Chapter Approved
Eldar Tau
Chaos Space Marines Imperial Guard Tyranids
Daemonhunters Necrons Witch Hunters