Physiotherapist must firstly then your self

you definitely need a physiotherapist to rehabilitate your knee joint. self exercises are not advisable. your exercises should initially start with pelvic tilts to improve your low back mobility and to normalise your hip- pelvic alignment,which is the key for a normal functioning of your knee joint. this should be followed by graded lengthening of your hip flexors and calf muscles and finally training the knee muscles.

Greetings,  it is mandatory that you take at least 4 weeks of physio to know how to get back to normalcy with exercise.

Please meet a physiotherapist. Post surgical Physiotherapy should be done under guidance.