It is not too difficult if you have DIY experience. Below is briefly what I had done for my DIY cabinet.
Basically, I just fixed up the cabinets without the doors, which are top, bottom, left and right planks (no back plank for my purchased) and a horizontal plank in between. The doors can be fixed after the cabinets are up, as this will 1) reduce the weight 2) let you access the back of the cabinet 3) door will be more align if you fixed it later.
The cabinets come with bracket to hold the cabinet, take measurement of where the bracket should be after the cabinets is assembled. After measurement marking is make, drill one or two holes and screw the bracket loosely to the wall. Mount the cabinet on the loosely screw bracket, and screw the cabinet to the bracket. Once it is mount on the bracket, the weight will be on bracket, adjust the cabinet until it is straight (with water bulb), right angle etc before tightening the screw to the wall. The rest of the bracket measurement are easier once the cabinet is supported by the top left/right bracket. Continue to drill the others holes for other bracket and mount the cabinet. Take out top left/right bracket after all other bracket are fixed, and drill the remaining holes which I did not drill earlier and finally mount them back again.
I had previously DIY IKEA billy book shelf (not wall mount type though) for my previous house, I find Taobao cabinet heavier though it is smaller in size). Taobao cabinet wood plank are more solid than IKEA book shelf (knock on them I can feel the difference). My previous Ikea cabinet shelving sink after few years of using. Taobao cabinet looks quite heavy duty and I think it should last longer (still too early to tell as I just mount them few months only). Take note there may be weight difference if your IKEA cabinet is those with not so solid planks.