TPMS sensors are user installable if you purchase the sensors that screw onto the valve stem. Internal (to the tire) sensors require professional installation. You will also need professional installation if you need to replace rubber valve stems with metal. While some have good results without switching the stems, my TST flow-thru sensors require metal stems (per the TST instructions). After a shop replaced my rubber valve stems with metal stems, I installed and calibrated the sensors following the instructions.