Learn to do the headset yourself, it's simple but does require a specific allen key size. I think it's 10mm but I'll double check that.
There are no bearings in there, it's a really minimalistic design using plastic in place of bearings and essentially it can be treated as one would an Aheadset. So you simply loosen the allen bolt on the side of the lower clamp section then adjust the large allen bolt that screws down into the steerer until there's no play in the headset but it still rotates freely, then re-tighten the small allen bolt on the side of the lower clamp section.
Once you get used to these things if you notice any wobbliness in the bike in the future you'll be able to troubleshoot where it's coming from.