iMac 21.5 inch Late 2015 HDD to SSD

Hi everyone.

First of all, I want to set things clear with the model of my iMac: It is a Late 2015 21.5 inch iMac, Model A1418 and EMC 2833.

Just wanted to clarify this, because when I set up my profile, the only configuration with the EMC 2833 is a 4K iMac, which is not the one I have. Mine is NOT a 4k NOR a 5k iMac, it is a standard 1080p with 2.8 Gigahertz i5 CPU.

Question is as follows: I want to change the 1TB HDD which came with mi iMac with an SSD. Problem is I´m totally new to this world, and I´ve never opened an Apple device.

I would like to change the old 1TB HDD 5400 RPM to a new 1TB SSD, so I need help with the whole process: How to disassembly the iMac, how to remove the HDD, which SSD to buy (I want a good, fast but not so expensive one), how to install the new SSD, etc.

I heard that in some cases, there was a problem with the fans going crazy with SSD in iMacs, so I really need help about that, too (heard there were some thermal sensors to plug in to the new SSD to avoid that). Also, I don´t want to loose any of my HDD data, what I want is to “clone” my HDD to the new SSD.

Any advice, tutorial, guide or help is really appreciated in advance.

Thank you so much, guys.