I am not a native English speaker, and I am writing a paper in English (maths) with the aim of getting published in a peer reviewed journal. If I write the manuscript myself, the poor grammar would prevent it from being accepted. If I give the manuscript to a native-English speaking expert in my area of maths, they may steal my ideas. If I give the manuscript to an expert just in English, they won't be able to fully help because they won't understand the ideas comprehensively.
Would someone please guide me how to solve this situation?