Only blow out the dust
Don't forget to post temps btw .
Then, like I said, I'd suggest repasting the laptop. If you're not comfortable doing it, you can take it to a repair shop if you want.
If you do it yourself, just go slow and keep track of all the screws you take out and from where (make a diagram if you have to).
You'll also need:
Isopropyl alcohol (rubbing alcohol)... at least 90%
Coffee filters (they're non-lint, and super cheap for a large pack of them)
Thermal compound (I prefer TX-2 personally: Tuniq TX-2 Cooling Thermal Compound - Newegg.com )
how much ram do you think would be enough?
Honestly 6gig is fine... Unless you're actually using up all that space (unlikely).