Wiring in new halogen headlamp

I was at the local auto parts store and found a h4 lamp that should work-size appears right and watts seem ok. My question is- the back of the new bulb has 3 metal tabs coming out. The back of the old lamp has the wires hardwired to the bulb. Can I just cut the wires off the old lamp and hook them directly up to the new halogen bulb via the tabs on back of the bulb? Or is there more to it than this? I need to change out the old lamp and and wondering how to go about this.