I like Reaper and have used it for various things for years.

Once you get the hang of it it's easy. Download (it's free to play and pratice with) and have a go.

All you would have to do is to drag or add the media file in. It then depends what you want to do with it. It comes with lots of buolt in filters etc to clean up sound. You can Normalise the sound up to levels.

The manual is ummm... comprehensive as it is a full blown DAW.

it depends what you want to do.

I used to take it to gigs and have a load of reasonable sounding tracks same evening once I got in the swing of it.

It was pretty much -
1 Take out memory card and download file to machine
2 Open Reaper and Import file
3 Right click on it and normalise the sound
4 Break it into chunks of what I wanted
5 Apply filters
6 Export as mp3s

If you are interested I could show you.