Over more than 12 yrs, I have updated my Pentax cameras (i.e, Samsung GX10/aka K-10D, K-5, K-30, K-3, K3 II, and K-70) - I think I only ever had a couple of failures out of 20+ attempts, and those were either because the battery was not fully charged or I didn't carefully follow the instructions (which are actually very easy to follow, if you read them carefully beforehand!). And I never "bricked" the camera and the ones that did fail first time were fine on the 2nd attempts.
Therefore there is absolutely no need to be "paranoid" about having a go (and/or then having to drive maybe 200k to get someone else to do it), thus
1 - format an SD card to "clear it out"
2 - make sure the battery is fully charged (the green light on the charging holster goes out when it is)
3 - read the update instructions carefully (they do vary slightly between various cameras!), maybe several times, until you understand them
4 - download the updating file and unzip it to your PC/Mac/Linux m/c to produce a "
.bin" file
5 - turn the camera OFF
6 - copy that .bin file to the SD card, and put that in the camera body (best with a lens on some sort on it)
7 - turn the camera on and go into the Menu and then look through the submenus to find the one that has "Firmware" - enter that and click on "update" to start the appropriate update process for your camera - and then be quite patient until the process seems to have finished (and maybe another couple of minutes "to be sure"!)
8 - Turn the camera OFF and then back ON again, go into the Menu and and the Firmware one and and take a look at that - it should then confirm that the update has been successful and you now have the latest version
That is actually "Simples!" (as some of our UK tv ads tell us often)!
Go on - have a go!