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There have been aftermarket solutions to the front fascia from companies such as Tsportline and Unplugged Performance but these have been very expensive and has had some fitment and quality issues.

Parking sensors:

The new bumper will have 6 parking sensor holes. If you have an AP1 car with 6 sensors the harness may be difficult to make fit since the holes are placed differently. It should be possible, but extending the wiring is not unlikely.

If you have a 4 sensor car you can run into the same issue and you may need to extend some wiring. Here you can also come up with something smart to block the holes on the side. Bodyshop can fill in before paint for example. You can also go the route of upgrading to 6 sensors, but this is a whole nother topic I won't cover in-depth here. It requires new sensors, harness and ECU.

If you don't have parking sensors at all you can fill in the holes before paint, or do a retrofit to parking sensors. 

The new bumper comes with retainers, but these might not fit your sensors. You may have to move these over from the old bumper.

Active aero louvres:

The old louvres besides the fog lights will not fit the new bumper unless you do some cutting. More info on the cutting can be found here. 

Because this old louvres often don't work anymore I just opted to get the MS2 part. Some money can be saved here if you reuse your old ones.

Sourcing parts:

You can absolutely buy the parts used. They do not have to be new through Tesla.

You can choose to keep the radar in the same location and use the old grille. In this case you will not need 1058022-00-B. 

However, if you want to a true facelift look you will need the AP1 radar bracket, Tesla Toolbox and a way to change config. Part number for the bracket is 1061953-00-E. You will need to drill 2 holes in your crash bar. Make sure you get a carbide drill bit and not a Titanium HSS one. Use picture below for reference. Doesn't have to be 100%.

You then add "radarposition 2" to gateway config and do a service-redeploy in cid-updater.

Then you adjust radar it vertically so it is level and then you run the radar calibration procedure under Driver Assist in Toolbox. Adjust radar horizontally and run procedure again until it is happy with calibration. Voila, AP1 should be working again. Existing harness is plenty long for this relocation.

Here is a compiled parts list of everything needed to facelift. I know that a lot of these screws/nuts/bolts aren't needed as you can reuse the old ones, but considering the price I just ordered to have extra and spares if something didn't fit or was missing. You can take this list to your service center of choice to get an updated price quote.

I got all the parts loaded in my Model S and was eager to tackle this project as soon as the snow cleared.

Now you can start disassembling your old front bumper and start attaching stuff to the new one. It should be fairly straight forward as it's more or less the same. You can actually reuse most of the bolts as well.

Now it's time to fit the bumper on the car. Make sure you install the new ankle catcher which is the flat piece in the bottom of the first image below. Some modification was also needed for the V-bar bracket so it needs to be cut beforehand. Also make sure you replace the old fascia brackets with the new ones.

I unbolted the + point for jump starting as it was interfering with the radar that I have installed. You may not run into this issue.

I know this guide doesn't go in depth on how to remove bumper and where all the bolts and nuts go, but I figured it was kinda self explanatory. You can always use the Tesla EPC for reference pictures and instructions on what goes where. I'll let the final result speak for itself.