You may have leak in your condensor, not in the line leading to it. In any case, replacing the leaking part is merely a matter of unbolting the bad pieces, and installing new ones.
The fancy part comes in RECHARGING the AC system, as replacing any parts will result in total loss of refrigerant pressure.
Unless you have an AC manifold/guage set, and a vacuum pump, leave this part to a shop with the tools and training. At least you will save yourself the labor on the defective part replacement.