I would suggest hiring professional lawyer for filing under EB2. It's a lengthy process that might take 1.5-2 years for getting GC and if you receive RFE during all these proces, that might even take longer. I do not recommend any specific lawyer, every company have their own lawyer. If not, Nepali lawyers are equally professional in EB2 case handling. And yes, lawyer fees are always high, no doubts. They charge based on each steps and nothing is refundable. On top of that, USCIS fees and medical fees need to be covered as well.