Fisher 500b biasing the tubes

I have a Fisher 500b receiver. I want to put in different power tubes. Could someone walk me through the steps to bias the tubes? I have the meter and I have done it before on other more modern tube amps. I need to know where to hook up the meter and what readings to use to bias the tubes. This should be basic as I will also need to know where the controls to adjust and set the bias are located. I don't mind if the person who responds talks down to me a little. I want the explanation to be very basic.

I am not understanding what I would need to do. I am not that well versed in this area.

What would happen if I just install the new power tubes without any adjustment? What will be the effects? If the life is shortened, how much will it shorten? How will it affect the sound of the receiver? How much effect will this have? If the sound is not as good, then how bad or how much less will it be? Again, if the life of the new tubes is shorter, how much shorter will it be?

It's fixed bias, so it's not quite that simple, and Fisher didn't make it easy for us.
There are a couple of good, relevant threads here on the Fisher stereo receivers.

http://www.audiokarma.org/forums/showthread.php?t=140768&highlight=fisher
http://www.audiokarma.org/forums/showthread.php?t=140313&highlight=Fisher
http://www.audiokarma.org/forums/showthread.php?t=78700&highlight=Fisher+400
(the 500B, 500C, and 400 are extremely similar in the output section)

PS. don't stop your re-hab until your 500B looks like Cut-Throat's

you will need to install cathode resistors. that's what i did. you should do a complete update by replacing the selenium rectifier and all the caps.