With the proper technique, it's a long, but easy tame ;

1rst step : tame a scorpion, or arthropleura from within the caves (really important)

Imprint the MD as much as possible, until you'd find the gigano

Use the not-an-insect-even-though-every-one-say-they're-bugs, to attack the big one (he won't agro on you, unless you dismount)

Between each attacks, wait few seconds, until he'd recove 1hp

After a long while, he's knocked out, just bring him food... & Narcotics 👍