Dear betterjm,
It is understandable to be concerned when God wants to use you. But if He really wants you to do this, He will provide the tools, people, resources to fill full His will. The one person in the bible who felt he was totally the least likely person was Moses. Moses said ..." Who am I..."(Ex 3:11) and then he said ..."What if they do not believe me or listen to me and say, 'The Lord did not appear to you'?" (Ex 4) and then he said ..."O Lord I have never been eloquent, neither in the past nor since you have spoken to your servant. I am slow in speech and tongue." (Ex 4:10) and then he said ..."O Lord, please send someone else to do it." (Ex 4:13)
He tried four times to get out of it, but the Lord followed thru and provided for Moses.
I have meet Ray Aguilera and he is a very humble and unassuming person with very little resources and yet God has chosen him to be His prophet. What he has done thru the Holy Spirit has been totally amazing.
I believe that God will provide what you need, you just have to simply obey and trust in Him. This may not seem easy at times, as Ray has had his doubts and questions, but the Lord has each time told him not worry, the resources will be provided. Just do what I ask.
If this is something that God has really put on your heart to do than He will be with you every step of the way.
I hope this helps, this has been my first post and I felt the need to answer you. My pastor had a sermon a while back on this least likely to be called and he used Moses as one several examples, there are many more least likley characters in the bible so you are not alone.
Yours in Christ,
Chuck Fagan