Hi Rob,
WELDERS can be a mystery to those who cannot weld but like many things practise and then more practise. I've been practising for years and to me it is still a hit n miss affair. My big issue is being able to see what I am doing. My arc welding helmet was too dark as my looker glasses also darken in bright light so I bought another lense which is the lightest to help see things. Still having issues I bought a new set of reading glasses that are clear and this helped a lot.
One day I went even madder than normal and researched and bought a MIG online. It too can be an arc, TIG and MIG welder and in the bginning I bought the gasless wire to use as the rental on bottles was too rude.
With minimum success using gasless wire I found out by accident I could get my gas at Bunnings, only a small bottle but I'm not making a living out of it and this was around $100.00 as a one off cost then simply swap the bottle over for refills and that last time was around $90.00. Bought the standard wire and changed the polarity over to run on gas and this helped me out a lot and sometimes I get good results and other times as in the pics not so good. Something I did before jumping in the deep end was watch a heap of YouTube clips and look for the tips and hints they offer. Also I get positive feedback as to what I have done wrong by qualified forum members who really know their stuff and I take that onboard as a positive thing as I certainly am not good enough, yet.
As for TIG, I used to be a very good oxy welder when I was doing an apprenticeship as a panel beater. I dont have the TIG attachements either and possibly wont as the MIG with 0.8mm wire can weld down to some fairly light metals whic I wont find on a tractor and recently did a heap of rust repairs on Loryy the truck which is up for rego inspection this Friday and is all pretty and ready to go. I can only suggest that you too look at some video clips and see what can done and how much quicker it is than using arc. My arc welder was nicknamed "the battery charger" as it is not much bigger than one and is almost as light but bou can it put out some juice. IT is an inverter welder and it is a pleasure to use and had it in action on the box trailer recently.