No problems Joy
Actually your Toshiba manual may be best to download anyway, because you really need to follow all safety precautions
(ie Power and battery out; and adhere to all anti-static warnings)
But usually it's quite simple
Remove all power
Turn the laptop over
Locate the Ram plastic cover
It will probably have one screw to remove (some have clips)
Remove the screw and cover
Hopefully you see the Ram cards
Unclip them on the side of the Ram (gently)
Then pull them out
Blow out all dust
Squeeze them back in, and then seat them down, until they click in
Put the covers back on
By the way, I was talking about the internal Harddrive, which is pretty much the same principle as the Ram (different cover though)
More info here:
Tutorial: No POST (Power On System Test