Hiyah 
1.Always look at your paypal NOT ebay to see your item is actually PAID.
2.Always look that paypal says
K TO SHIP.
3.ALWAYS ship to the address on PAYPAL if the buyer wants you to ship to another 1 then tell them you will cancell the invoice and they can add that Other address to their paypal and then you resend the invoice.
4.Never give partuals unless they PROVE damage like a picture.
5. when a buyer pays leave feedback when you ship.
I hope this helps Good Luck 
Life Is A One Time Offer,
Use It Well.