You wont need many tools to assemble your computer, in fact the only must
have is the screwdriver, but if you can get most of the following together, youll
find things go a little easier.

Basic tools
Before you begin building or refitting a computer, you will need some basic
tools:
1. 2 phillips-head (cross-shaped) screwdriver
2. Needlenose pliers
3. Anti-static Wrist Strap
4. A large level working space

Optional, but useful tools
Some other tools and equipment can come in handy as well, such as:
1. Grounding Mat or anti-static carpet
2. Spring action parts grabber.
3. Electrical tape
4. Flashlight
5. A second, working computer to swap parts, look for tips, ask for help
online, download drivers and patches, etc.—very useful
6. A can of compressed air—useful when working with older parts that have
collected dust. A better alternative but also more costly, is a vacuum
cleaner designed for cleaning electronics.
If you do not have access to an anti-static mat or wrist-band, when working
on a table rubber or leather-soled shoes can help prevent static charges obtained
from walking around, although if you move your hands upon the ground, say
picking up a dropped screw, your static charge WILL stay with you until you
touch something metal. Therefore, after doing anything that might have potentially
caused you to pick up a static charge, ground yourself on an unpainted
surface of the computer case before touching anything electronic.