I've never worked on a Husky 61, but I can tell ya the basics. The clutch is under the sprocket drum. Take the side cover off the saw, remove the bar and chain. The sprocket is typically threaded on, but the threads are 'left-handed', they screw on in the opposite direction of normal. Remove the spark plug and stick in a piece of 3/8" fuel line or something that won't scratch the cylinder or leave debris in the cylinder. (DON'T use a screwdriver!) This will stop the engine from spinning when you take the sprocket off. Remove the sprocket by turning it CLOCKWISE (remember, the threads are reversed). The clutch is under the sprocket, typically 3 shoes (like miniature brake shoes) held in a circle by a spring. Slip the spring off with a screwdriver or something and R/R the clutch shoes. If you are going to do all that, go ahead and put on a new sprocket also. Screw on the new sprocket COUNTERCLOCKWISE (backwards threads) and snug it down. Put your spark plug back in, put the bar and chain back on, and you are good to go!
Normal mechanic's rules apply here, clean/inspect all parts before re-assembly, replace worn stuff, etc.
Huskyman or someone, let me know if I missed anything!