I have followed this step by step guide by iFixit. It included all the steps to help you open the Mac mini A1283. You will need a “putty knife”, you can get that from SACO hardware store.
It is better to not buy the RAM from Apple. Instead I highly recommend Other World Computing. I bought 4GB DDR3 upgrade for the Mac mini A1283 for $64! They ship internationally so you can either have it shipped directly to Saudi Arabia or use myus/Aramex.
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yeah, that’s why I don’t mind doing it 🙂