Like I have said before.
It is amazing to me with all the bad looking welds I have seen over the years (some on certified planes) that extremely few accidents can be blamed for it.
This is a true testiment to how most steel tube aircraft designs are very forgiving as well as the welding process. Especially O/A torch.
In another post I described some testing I did many years ago as to how bad a tube joint could be welded and still have amazing strength compared to the required load of the average application for that tube size and wall thickness.
This is not an excuse to weld badly. Just an observation that tends to support the satistics.
Welding with a torch seems to be the most forgiving.
Welding with O/A and torch is like learing to milk a cow. You can take lessons from the farmer and learn on 10 cows or learn on your own on 50 cows.
Pracrice, Practice, Practice, do some simple testing to build your confidence then practice some more.