For absolute begginners, you will only need a pair of nippers to get started. But it is also reccomended to get a sharp hobby knife [be carefull!], tweezers, and some sandpaper or a sandpaper stick to remove any nubs or rough edges from the plastic pieces.

Using nippers, carefully cut out the pieces from the plastic runners. Be sure to follow the instructions carefully and take your time!

[Pro Tip: Always cut with the flat side of the nippers away from the plastic! That way you avoid chance of damaging the plastic parts].

Some grades of Gunpla have inner frames such as the Real Grade [RG] or Master Grade [MG] line ups. The frame is the inner skeleton of the mobile suit and provides the structure for the rest of the model. Follow the instructions to assemble the frame, being careful not to force any pieces together. 

Armour pieces: Once the frame is assembled, begin adding the armour pieces to the model. Be sure to follow the instructions carefully, as some pieces may need to be painted or customized before they can be added.

Many Gundam kits come with decals and stickers that can be added to the model for extra detail. Be sure to carefully apply these, as they can be difficult to remove once they are in place.

You can also purchase various water slide decals, which eliminate the hard edges of normal stickers!

While this step is completely optional, this will take your snap built kit to a whole new level! Once the model is fully assembled, you can add some panel lines to all the thin line gaps, which will make the mechanical parts stand out. Finally, apply a topcoat to protect the surface, seal in the panel lines and give the model a finished look.

Finally, display your completed model with pride! Many Gunpla fans create elaborate dioramas or displays to showcase their models.