I'm sure many readers will have been moved to sympathy by the account, in the thread attached to an earlier post, of the sufferings endured by an Anglican priest desiring to enter into Full Communion with the Catholic Church but meeting only hostility. I know how he feels, because I have myself been somewhere like that.
On the Internet there was recently a debate about what a 'convert' should do, say, and think when, having been required to undergo the RCIA, he discovers that he is being taught error or, indeed, heresy. Is it necessarily arrogant for such a 'convert' to behave as if she knows better than her 'instructor' what her 'new Church' believes? (Praetereo the not-entirely-unhysterical view of Austin Ivereigh, that such converts have a 'neurosis'.)
This is not a new problem.
During World War II, Dom Gregory Dix temporarily took over his brother's church in Beaconsfield so that his brother could sign up as an Army Chaplain.
One of his parishioners decided to 'convert'. Since Dix was a very convinced Anglo-Papalist, this caused him little concern. But there was one thing he could not and would not overlook.
So the Monsignore at S Theresa's Church found a very eloquent Dix occupying the presbytery doorstep.
"Your curate is instructing my Mrs X for reception. But he's teaching her all wrong!"
(Incidentally, the Oxford Oratorians, who run a very fine show, do not stretch out their 'converts' on Mgr Procrustes' rather lumpy bed. Each person is prepared individually and 'received' when (s)he is ready. Now there's a community that know its business.)