I first ran across a series of videos done by a small engine repair fellow over on the SnowBlowerForum. I found them really helpful in doing repairs on snow blowers and engines. They're just plain entertaining as well. Anyway, I did a simple search on his You Tube channel for mower, and turned up bunches of them that he's done on mower repair as well. Since it won't be long before we're back into the mowing season, I thought I'd post the link to his site for everybody to take a look at. They say a picture is worth a thousand words, and this fellows videos are worth millions.
Let me say this, use the videos as a guide and work within your own skill level.
donyboy73's Channel - YouTube