Do I really need anchors or bracing? If so, how many do I need? Which style do you recommend?

Yes, anchors/bracing are important to the long-term stability of the edging.  In almost all cases, 2 per section is recommended. There are 2 choices:  1.  The universal turnbuckle style simply clips to the back of the edging bracket and is extended via a chain diagonally where a peg is pounded into the ground.  2.  The anchor post is screwed to the side of the bracket on the back of the edging and pounded into the ground vertically. The anchor post works well in normal soil conditions.  Concrete should be used around the post.  The universal turnbuckle brace works both in normal and soft ground conditions.  Please note that in soft ground conditions, concrete is recommended around the peg and nails as well. As far as ease of install.  Neither is hard to install, but the Universal turnbuckle style is probably the easier of the 2 methods.

Can the rigid and flexible edging be joined together?

Yes, they both have the same connectors, so they can be joined together.  In fact, the 9.5”, 15.75”, and 22” can all be connected together at the top.  This helps in situation where there is a slope, and you need to bury a portion of the edging.

What type of saw should I use if I need to cut the edging?

The manufacturers recommend an angle grinder.  The main point in selecting a saw to cut with is that it uses a metal cutting saw blade and that you are comfortable using it.  If you are not comfortable using a saw, we highly recommend getting a professional’s assistance.

When do I need to use a joining sleeve?

Joining sleeves are used to reconnect edging that has been cut.  If you cut the edging, therefore cutting off the pre-built-in connectors, and then need reconnect it to another piece and joining sleeve is used to re-join the pieces.

What is included in the price of a single section of edging?

Included in the price of the edging are 1 – 7-foot section, a joining plate to connect the edging to the next section, and 5 long twisted nails.  Bracing/anchors, premade corners, and joining sleeves are purchased separately.

What are the dimensions of the pre-made corners?

Each arm of the corner is inches.  So, 10 inches then a 90-degree bend and another 10 inches.

How heavy is each 22" panel?

The 22" panels weight about 48 pounds each.

Do you hammer it into place? How would it act as a retaining wall, or do you build the wall and then this is just decorative. I have a. narrow space and cannot build a traditional retaining wall. what I’m trying to retain is about one foot high and a gentle slope.

The edging uses long twisted nails that hammer into the bottom foot of the edging.  In addition you would need to use bracing to support its retaining function.  The edging is engineered to retain up to the level of the edging.  In other words, this particular size (22") can retain up to 22 inches of soil.

I find it much easier to see a demo than explain, so below are two helpful videos that show the install and bracing process.

Below is a video link that demonstrates how the edging is installed.
How to Assemble 22 inch (560mm) Edging

Below is a video link that demonstrates how the bracing system works.
Bracing For Retaining