Is there anything wrong with the idea of self-taught and self-appointed pastors? Should men who instruct God's people be:
a) Theologically trained, including learning the original languages?
b) Called by a church to plant a church or fill an opening in a church?
I don't know about "self-appointed," but I will comment on these...
a) Theologically trained, including learning the original languages?
Given the state of Modern Theology, I hate to say it, but formal education can be one of the worst things that can happen to a "preacher."
Its my opinion that the indoctrination which takes place can often "blind" some.
As far as learning the original languages, I don't think this is necessary, though I think we all need to be able to consult those who do know the languages and can help us better understand Scripture as it was originally given.
b) Called by a church to plant a church or fill an opening in a church?
If you have someone that understands the Word of God, has a heart for the people of God and the Lost, why wouldn't we utilize him in a role of leadership? I think the point made that an adherence to a Biblical view of training those in leadership is critical, but how many who became Pastors in the early Church were men who were formally trained? How many of the Apostles were formerly trained? I can think of only one who began his ministry with formal training, and he said he counted his credentials as dung, lol.
I just think that indoctrination often keeps people from understanding Scripture for themselves, because it points them to what they should believe, which can cause them to overlook questions that arise when we follow God's direction in Study. An analogy might be like this: I stop by a friends house and, they are not there, and I notice that their flowers need watering, so I call them and say "Hey, your flowers need watering," and they say "Hey thanks, I have been getting home late and didn't know that." They come home, go to the hose bib, turn on the water, and water their flowers. What they don't notice is that the second floor is on fire, so as they water their flowers the house continues to burn.
People are told, "This is truth, now go study it in Scripture," so people go to Scripture and seek to build upon that truth. Rather, people should look to God first and foremost, and allow Him to direct our studies.
That is not to say we do not take advantage of the fact that God has placed teachers in the body, and we can draw upon them as we grow. But, many people do not actually know what they know, they have simply adopted what somebody else knows.
God bless.