I tamed my very first Giga today.
I know everyone says to use the metal gateway method, but I opted for something a bit more risky: A cage of giant stone gateways. Four, to be exact, with a door on each end.
I set it up at the base of the eastmost mountain on the island, and added pillars between the spaces of the gates to make absolute sure the giga wouldn't get out. I figured I'd need bait, too, so I bred my two summer bash event trikes and ended up with nice looking white twins. Both were named "Giga snack", and with my super easy settings I raised a poison Wyvern just to kite the giga. His name is Nymph and he actually has really cool colors: A brown body with deep green wings.
I also had a butt ton of narcotics and arrows from grinding in preparation a few weeks back, so I made a tiny metal base next to the stone cage and put everything I needed in it. My plan was to leave all of my things in the bunker, get on Nymph, grab a Giga snack, and kite the giga all the way from the top of the mountain into the cage where I'd drop the bait trike to keep its attention if the bear traps in the cage didn't snag it first and make it stay still long enough for me to shut the doors.
The plan was executed, and worked perfectly! Even if the gates are going to need serious repair, I know they can hold up to at least a wild lvl 1 Giga. And, as a bonus, Giga Snack survived! It landed perfectly on top of the gate while I was dropping it in during my escape. It still kept the giga's attention.
Once the beast was down, I let its torpor drop to half before loading it the hell up with narcotics. That kept it down until it ate.... once! All it took was one kibble, and he was mine.
Do I have super easy settings? Yes. Am I proud of my achievements nonetheless? Also yes. I named my Giga "Hulk", because you won't want to see him when he's angry.
I can't attach a picture, but here's a clip of me playing with him around my base:
https://gamerdvr.com/gamer/dragonhop417/video/79259610