In order to help others with the process, you need to be familiar with it. Familiarity with the group creation process. Understanding of some namespace issues on Usenet. Familiarity with voting disasters and why they are Bad. Capable of being simultaneously firm and diplomatic.
Mentors act as assistants to the proponent.
The mentor will review and approve the RFD and then submit it to the news.announce.newgroups moderator. Other comments should be sent to the person who volunteers to handle that subject. Mentors are advised not to vote at all on the proposal they assist. If a mentor is also a UVV member, the responsibility to hold confidential anything from the UVV mail list takes precedence. This is because the vote-taker needs to be able to ask for advice in a confidential forum if voting has already started.