Overclocking?

I'm really interested in a possibility of increasing my CPU performance on
my Vista Ultimate 32-bit PC, with the following motherboard and CPU:

nVidia nforce4-MA motherboard (AM2 socket)
AMD Athlon 64 (3000+)(runs on 1.81 GHz)
1 Gb RAM
Cooler Master Gemin II processor cooler (non-stock)

Note: Windows Experience Index is 3.0 because of Processor, all other
ratings are 4.5 and higher!
Note #2: I have all newest motherboard (and other) drivers!

Question: Should I try overclocking, and if yes, by how much, and how?

Thanks in advance for your time and effort!

Emil Lulic