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In this plan set, the tongue is referred to as the drawbar - my apologies for any confusion.
If you do not have access to the correct equipment, it is preferable to get the drawbar professionally bent/rolled to ensure the integrity and strength of the hollow section is not compromised.
It is not recommended to cut and weld the drawbar to get the desired shape, but if there is no other option, strengthening side plates need to be fitted. See below for more details.
The side plates need to be fitted to both sides of the drawbar and stitch welded evenly around the plate. Stagger your welding to prevent any twisting or distortion of the drawbar from excessive weld heat.
Mark out and drill the tilt hole. Ideally drill from both sides if you do not have access to a drill press to prevent any offset of the hole.
Fit and weld a compression tube within the drawbar for additional strength. The compression tube is only required to be securely welded - a full weld is not required.
Pre drill the drawbar for the coupling as per the manufacturers recommendations.