Audio Clarity Enhancement for Video

I need help with tweaking the audio on some video footage so it can be understood better. The main issue is whispering and faint sounds from another room that need to be brought to light.

Requirements:
- Remove background noise
- Adjust volume levels
- No addition of background music or sound effects

Ideal Skills and Experience:
- Proficiency in audio editing software
- Experience in enhancing video audio quality
- Attention to detail and good hearing acuity

This is for personal use, so I need a clean and understandable audio track.