1) Install
0.7.1: http://pastebin.com/LPb4FEv4
0.7.0: http://pastebin.com/2kG4V3tB
0.6.0: http://pastebin.com/bR33cXDU
You can use internet card, and command:
pastebin get LPb4FEv4 holo
2) What do you need
a) Diamond Screen and Graphics card (for good resolution). Beginning from version 0.7.0 you can use a golden GPU card.
Diamond processor (just faster; before OC 1.4 it's not important)
c) 2 Golden memory planks.
d) Internet card (to get program from pastebin)
e) Hologram projector (to preview your creation)
f) other parts, any levels