Yes, depending on your level of familiarity with automotive repairs and the model of the car you have, replacing a faulty relay should not be too difficult for most people. It will likely require some basic tools such as screwdrivers, pliers, and wrenches, but no specialized experience or knowledge is typically needed. Refer to your owner's manual for more detailed instructions on how to replace the relay. Before attempting any repairs, it is always best to check with a professional mechanic first in order to ensure that the job is done safely and correctly. Also, make sure to use a new replacement of the same type as your faulty one in order to avoid further complications.