Myth #1: Enhance!
Thanks to crime drama shows there is a prevailing sentiment that somehow, image editing programs can enhance even the blurriest, low resolution image to crystal clear perfection. Sadly, this isn't the case. Some enhancement can be done, but nowhere near as much as crime dramas would have you believe. The fact is, if you want high quality images, you must start with high quality images. Images with high resolution and that are clear, and mostly blur free will give your designer the best result.
Myth #2: It's just a filter.
It might be just a filter. Is a hammer just a tool though? Like any tool filters have their places, however, when used by an inexperienced person it's not as effective as it could be. Auto-enhance and similar features do a great job some of the time. Often, a custom solution using a variety of filters, effects, and tweaks will give a better more polished result.
Myth #3 - The program makes the designer.
Generally speaking no. What's the difference between the logo done in the open sourced InkScape vs. Adobe Illustration when done by designers of the same skill? There isn't one. Design programs are tools, that when used by a skilled operator provides the desired results. Will Paint ever replace Photoshop? No, but that's not what it was designed to do.
Myth #4 - It's only a quick change.
All you want to do is get rid of that background and replace it with the other one, right? It should be easy. However, even with tools that make it easier to delete the background it still can be a time consuming process, especially with detailed images. Then there's the matter of matching the foreground to the new background. Blending the edges, ensuring the lighting in foreground and background match, the colors are cohesive, etc.
Myth #5 - It's just a logo!
Is it really just a logo? No! A logo represents your entire brand, and will for some time. Do you really want just anything representing your company or brand? Or do you want something special, that really represents your brand and what it's all about? That reaches out to your customers and is instantly recognizable? Even the simplest looking logos requires a lot of research and planning before the design stage is even hit.