How many hair removal sessions do I need to see results?

I am considering hair removal for the summer, but since it is my first time, I have many questions. When I search online, I see a lot of talk saying that you usually need at least 5 sessions, but I am curious how many sessions actually required to see satisfactory results. I know that it varies depending on the area, but I would like to know how long it typically takes on average.

I am also curious about the typical interval between treatments and how much pain is involved during the first session. I would like to know if it is okay to receive the treatment immediately after shaving, and what the most important aspects of post-treatment care are. Since my skin tends to be sensitive, I am particularly concerned about redness or irritation that may last a long time.

For those who have actually received hair removal treatments consistently, I would appreciate it if you could share your satisfaction level, as well as any aspects that were more convenient than expected or any inconveniences you experienced.