The GTX660 uses 16 PCIe gen 3.0 lanes. The h61m-hvs has one PCIe 3.0 x16 card so it is a perfect match (2.0 cards will work in 3.0 systems and vice-versa, but having both at the same speed means you eliminate a bottleneck). The card does draw 150 watts and requires that your power supply have one six-pin PCIe power cable available, so it depends on your power supply. What PS do you have?
Also, I can't resist. "Am I able to install it?" Depends on how handy you are with tools. Have you ever worked inside a PC before?