1997 Buick Lesabre Valve cover gaskets

I bought this car and noticed it has some oil leaking from the top part of the motor where the two come together my bro says its just the valve cover gaskets it runs fine and it doesnt drip to th floor so its not that bad i was told the car was well maintained and seems like it was, im wondering how hard a job this is and if this is done just like any other valve cover gasket repair is done and is there anything i should know befor we do this. is there a step by step link u could give me or something like that my bro has done these befor so i should be ok but im just looking for extra info