They are two separate systems, but they are also both an easy swap out, except for the ignition lock, but that one is the most important. I would go for it, especially since you bought your car from a doggy dealer, you don't know if they still have keys to your car.

Make sure you can re-program your keys if you have the transponder keys. It might not be a big deal, but I've never done that, so I don't know how difficult that part is.

 

So it will be difficult to swap the ignition barrel/something that can't be easily done at home? I've not swapped out a locking system before so unsure how big of a job it is if they are two separate systems.

 

Somewhat. They are designed to be difficult to remove. Typically, they will have one-time-use mounting bolts that break on installation so they can't be removed with normal tools, so you have to drill out the original mounting bolts, and replace them with a new set.

I would check your service manual. It will have specific instructions for your car.

Also, I would read through the procedure in your manual a couple of times, make a list of any parts the manual says to replace, and get those from a dealer before you start taking things apart.