Oh how I've fallen trap to this so many times when I typeset manga. I tell myself "Well, I've typed it out and seen the lines with my own eyes, it can't be wrong, I know my spelling", after which I proceed to upload the work without even reading it over once, only to then be met with comments pointing out 2 or 3 typos in different pages and forcing me to OCD and turn my computer back on at 2AM to photoshop those pages again. For shorter things (definitely not applicable to big VNs), when you don't have someone to QC/Proofread (as in, someone qualified for said position), my suggestion is to at the very least read the entire finished product a couple times yourself and show it to one or two people, chances are they'll spot a lot of the basic errors pretty easily. I've found that just having a couple people review my work before I upload it has significantly decreased the amount of typos I make.