Don't do it! One goof with the refrigerant or leaving a leak in the connections brings big difficulties. You might get lucky enough to bend the tubing without kinks and braze the lines at both ends of the tubing without burning the connections and seals; but if you can not solder water lines perfectly, brazing is more difficult. If you lose refrigerant, aside from possible damage to the unit because you do not know how to check refrigerant levels and do not have the tools, you can not charge the unit as purchasing refrigerant is illegal without an EPA license. Some refrigerants cause cancer.
Find an expert air conditioning company and use their expertise. Air conditioning repair requires knowledge of the equipment, refrigerant handling, electricity, plumbing, as well as brick and carpentry work.