Play the test battle mission in a different area, the one against 4 bb1s with ff guns. Practise turning about and shooting them :)
If you use auto you will incur an exp penalty, I think it's 20%. Keep trying with manual, you'll get the hang of it eventually, everyone went through a period of getting used to manual. BB could prove a little unforgiving, practising earlier would have helped, but youll get used to it nonetheless.
Just remember that when you turn, you can simply use Q or E to turn your guns to face the opposite side. Once your lines are together go back to use A and D to aim. Remembering wether to use Q or E to turn them clockwise or counterclockwise still gets me sometimes :)