I inspect the indoor one if it is accessible. If the outdoor one is very dirty I wash it and then check the unit. If not so dirty I start it and do a basic check. Then I wash it and recheck. If it is cold outside/ below 70F you have to be careful as a wet coil will give false discharge pressures etc. Takes forever to dry properly. That is why getting some basic readings first helps.
"Cut it twice and it is still too short".