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You can, but be gentle of the root systems on each. These do not like to be transplanted, and prefer to be rootbound in their pots. Just be very gentle, and expect it to slow down for recovery. Here is an article that will help: https://www.gardeningknowhow.com/houseplants/hpgen/should-you-repot-your-plant-happy-root-bound-house-plants.htm

As the name suggests, African violets like warm indoor air. Do not put them where it is chilly such as a window sill. They scorch if given a lot of direct sunlight from south-facing windows, particularly during summer. Read about other idiosyncrasies here: https://www.gardeningknowhow.com/houseplants/african-violet/african-violet-care.htm

I wouldn't, necessarily, take off any leaves. These plants tend to be a little on the finicky side, and it is best to cause as little stress as possible.

Now, you can carefully cut spent blooms. This will be fine. This article will help: https://www.gardeningknowhow.com/houseplants/african-violet/african-violet-care.htm

Unfortunately, these are very picky about their environment. This article will help you give them proper care: https://www.gardeningknowhow.com/houseplants/african-violet/african-violet-care.htm

This can be tricky, as these plants are VERY sensitive to change. The way I do it is very intensive, and requires your attention for multiple days. Cut the leaf or flower right where it joins the stem, and slowly cut back the stem as it dies. This will allow the plant to take back valuable nutrients from the stem as it slowly dies.

Here is an article for more information on the proper care of these plants: https://www.gardeningknowhow.com/houseplants/african-violet/african-violet-care.htm

Many African Violets come in a peat substrate that sounds like what you describe. This is fine. These can handle a dry period for just a little while, and I believe with correct bottom watering, that they will be alright for a week without further watering.

This article will give you more information: https://www.gardeningknowhow.com/houseplants/african-violet/african-violet-care.htm