IMO,this depends on you knowledge. Are you familiar with computers and CAD tools? Are you a woodworker mechanically inclined in general and comfortable in the shop? What are you intending on making; e.g.:signs, mechanical parts made of metal or some other use? Machining knowledge, things like feeds and speeds, material properties is required for intermediate to advanced projects. Have you watched videos where makers show you how things are done and/or give you a tutorial? If you have a weakness in some of these areas, you are probably find the issues related to them more daunting.
Whatever machine you get you will have to get familiar with its intricacies, experience and resolve issues. Sometimes this is easy and sometimes it is harder and takes quite a bit of investigating. It may be a setting, a misaligned, loose or otherwise broken part that causes the issue but finding it requires investigative work.
You have to learn several different software, you have to learn the workflow and stick to it to be successful; forget one item and you mess up your project.
You start with tutorials, make a few simple project that are part of the tutorials, expand your envelope of knowledge then learn some more, do something a bit more complicated. I may not have your question directly but hopefully it gives you some idea of the different things that may be an issue.