Hello...newbie here!! I am in the middle of recording a short children's story for Librivox and have recorded the darn thing about a dozen times!

I'm having a problem with the name of the main character and keep pronouncing it wrong in various parts of the recording (silly me). It would makes sense to re-record the little word or phrase and edit it in. However, when I go back to record the corrected phrase, the audio sounds different from the first one. So, that is why I scrap the thing and re-record the whole thing. I'm thinking there has got to be a better way. A small story should not take me this long.
Does anyone have advice on getting consistent audio, even during different recording sessions? Part of the problem sounds like the acoustics in the room. I don't have a padded booth or anything. I was thinking about taking a plastic bin and putting padding in there and put my microphone in there. Would that help?
The second observation is my voice, vocal tone, and even animation seem different. Perhaps this is a newbie issue, where I can't maintain the same vocal quality for my readings in different sittings. Any tips on this?
Thanks,
KIm