There is a documented process for the actual installation under the skin. Typically body mod shops are where you would get it installed as they already have knowledge on aseptic procedures. If you are looking for an installer, check out the DT partner map.
If there are no partners in your area, check out this guide to approaching a professional about doing it.
And since you are on the Dangerous Things site, you can also buy your implant from them (Or their EU distributor digiwell.com)