Forensic checking of document by expert

I am involved in legal litigation with my cousins around a fake Will. Originally my cousins would not produce the original Will in Court. Last month the original Will was produced. My allegation is that the Will is fake. I would like to have the original Will forensically checked by an expert to compare signatures. I need to have the original Will forensically checked urgently as I am an NRI and am only here for a short time. My question is can I hire a handwriting expert to compare signatures before the next date of hearing and also will he be able to examine the document?