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If you don't know what an SATA cable is then I have to ask are you comfortable with opening up the Mini and installing the parts yourself? If you have any doubts about installing the RAM And/or the SSD HDD I'd suggest finding a friend who has worked inside computer's to help you install it. There are many videos online on how to do this. I just don't want to see you force anything or break anything inside.

Installing the RAM I have little problem with.

Installing an SSD drive? No chance.

I would definitely do as you suggest and get someone who knows what they are doing to install it for me.
 
A lot of people would have trouble putting in an ssd. This thread link has an easy option to add an ssd.


https://forums.macrumors.com/threads/1317577/

I'd get more nervous with him trying to disconnect the small cables from the motherboard such as the previous SATA cable, the fan cable, and possibly the wireless cable (I don't recall if I removed mine or just let it hang back)
 
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