Depends on your ability. It's not hard to get off. Set the loader down, and release the hydralic pressure. Disconnect the top hose and put a bucket or catch receptacle under it. Knock out the boom pin, drop the end of the cylinder over a bucket, diconnect the lower hydralic hose and SLOWLY extend the cylinder to extract most of the oil. Remove the lower pin.
Depending on your tools and ability, best idea is to take it to a dealer. If you want ot tackle it, it's pretty much self explanatory. Remove the cylinder end cap and pull the rod out. Remove the end nut and replace the seals. To reassemble, put the lower pin in, then the upper pin, and reconnnect the hoses. Cycle the loader at least four times to bleed the air from the cylinder, and check the transmission level and refill with oil.