When is the best time to start hair loss treatment?

Lately, my hairline seems to be thinning, so I am looking into hair loss treatments. It is not severe yet, and it is not very noticeable from the outside. However, if I push my bangs back, the hair loss is definitely visible. I am wondering if it is better to start treatment early in this situation, or if it is better to wait until the condition has progressed a bit. I am also curious about how long it is safe to use medication or products. Additionally, I would like to know how the treatment is performed, as well as the level of pain and the recovery period. Finally, I am wondering how long it typically takes to expect results and whether consistent treatment is necessary. I would appreciate advice from those with experience.