Like any new welding situation (to you), you would be well served to try welding a sample similar to what you are working on. A couple pieces of 1/2" square stock (bare, no cad plating) clamped together in a drillpress vise and then drilled at the parting line will make two samples with half round "hooks" for practicing.
I haven't welded a hook that needs it on one of my guns yet, but this would be a good way of making practice coupons for setting your MIG machine and trying your technique. A TIG will be much easier to control. IMO, a MIG is not a good choice for this work and makes it riskier that you'll make a mess. IMO, MIG welders are for production work. But, it can be done, certainly.
