.45 ACP is one of the easiest cartridges in the world to reload. You should get some gear and get started. One thing nice about the .45 ACP is that it is a relatively low pressure cartridge so cases last darned near forever and never seem to stretch enough to need trimming. I've never trimmed a .45 ACP case, and I have cases I've been reloading regularly since 1977! They have been fired in semi-autos so many times the ejectors have marked the head of the case until you can no longer read the headstamp, and these cases are still going strong!
If you have a good lead source, you can save the most money by casting your own bullets. Of course that takes more gear, and it also takes time. Before I retired I never had the time, so I bought ready made cast bullets. By buying cast bullets you can still save money over shooting jacketed bullets. Plated bullets are half way between the cost of cast and jacketed bullets and, out of the .45 ACP, can be fired as fast as the cartridge is capable without problems. (Most plated bullet makers say not to push them over 1200 fps. You would have to push a light bullet hard to hit 1200 fps out of a .45 ACP, and you probably don't want to use a light bullet out of a .45 ACP anyway.) I use a lot of plated bullets because they are cleaner than cast bullets, they work extremely well, and because they ARE cheaper.
Whelenshooter