Turn the power off.
Remove light cover and bulbs.
Unscrew nuts or screws holding fixture to ceiling box.
Lower fixture and remove electrical tape from wires.
Attach new wires with wire nuts to corresponding wires.
Raise to desired position.
Attach new base .
Screw light bulbs back in.
Install cover and turn power back on.
Here is a great video on this https://www.youtube.com/watch?v=amB6wSn5LlQ
I hope it would be helpful!
Here ya go. You can do it.