I usually mount my cobs after I have heatsinks mounted on my frame. Shouldn’t be a big deal, just be careful as you’ll likely be moving it around quite a bit. Wiring isn’t that big of deal. You’ll want to put dc positive from driver to the positive terminal on first cob. Probably easiest to use one end or the other. Then you’ll run the negative from that cob to the positive terminal on the next cob. And then the negative from cob two to the positive on cob three. Keep following that method until you get to last cob in string only having negative terminal empty. The dc negative from driver will go the empty negative terminal on the last cob.
When you mount them. Make sure all the cobs have positive and negative oriented in the same direction. That will make all your series connections easier, save on wire, and have a cleaner overall look. Connecting the wires to the cobs should be as easy as stripping about a 1/4” off the wire and giving it a little push into the connector on holder. Once it’s in, give it a few gentle tugs to make sure it’s far enough the locking mechanism has grabbed it.
If you would like a tutorial, I would suggest the growmau5 I believe he has 7 part diy instruction. You’re probably at the point beyond the first few, check maybe 5 or 6. Sometimes seeing is better, but it’s pretty easy from here.