All of the above. The answer for you will depend upon how many slides, what condition they are in, what your expectations for image quality are, and how much you want to spend.
50’s slides means Ektachrome, and worse, E-3 process. This means that the dyes will be fading, and the quality you can achieve with a basic scan may be quite disappointing. A simple DIY solution may be far from satisfactory.
Good quality scanners, especially with digital ICE, are able to do fairly remarkable things with even quite faded images. Internal knowledge of exactly what happens to fading images helps, and they are able to extract information from what look visually very poor images. Indeed you will get images that look better than new. You probably want this.
If you have the time and a lot of slides, a dedicated slide scanner with digital ICE. Not so many slides, get them done professionally. You pay for what you get however. Scanning that involves any human intervention will cost vastly more. Thousands of slides really points at only one option. A good scanner with automatic feed. Sadly they are seriously not cheap. But you could sell it again, so the actual cost may be quite reasonable.
I would really encourage you to do as good a job as you can. The images will only continue to degrade with time, and yet, as time progresses, their value to you and your family will only increase. Think of it more as archiving.