I need to weld a channel bracket on the bottom of my dumptruck bed. This is to mount a electric vibrator to clear out the bed when dumping.

I was going to use dual shield Flux Core Lincoln outer shield 71m .045. 25v @ 250ipm. The problem is I absolutely suck at overhead. Every time I try it I feel out of control, craps falling everywhere etc. I want to do some practice first and try and figure this out.

Any advice is appreciated