Installing a microwave is a fairly straightforward procedure, aided by the fact that it is not meant to be difficult. Your microwave should come with basic pictorial and written instructions, which you should browse through first.
Place the microwave on a counter, shelf, or table top.
Plug the microwave in.
If the microwave is going over the stove as a microwave/ hood, make sure you leave enough room between the stove and the microwave. Refer to instruction manual for more details. Just be aware that the heat from the stove can damage and even destroy the microwave, so leave plenty of leeway. Have an outlet or a wire coming out from where you will install the microwave.
If you have a plug, before installing the microwave, plug it in. If the microwave has several wires instead of an outlet, hook up the corresponding wires. These are blue, blue red, red yellow, yellow.
Find the screws and drill the microwave into the wall through the holes already put in the microwave. Make sure you do not disconnect the microwave accidentally during this process.
Refer to instructions to put on covers, lights, etc.
Have an assistant if you think you can not hold the whole microwave and plug it in.
Use caps to connect wires.
If in any doubt, refer to the manufacturer's instruction manual or call the retail store you purchased the microwave from for more help.
Do not touch any of the live or "hot" wires or you will get electrocuted.
Do not let them touch the drywall or they could start a fire.