I'm a glass artist and designer and would like to make lamps and pendants. I'm told that I need UL approval for the electrical part. That is all the wiring etc. I know I can have an electrician who can do that part but I'm concerned about the approval. Is that correct? If so what's the simplest way to do it since I'm a one person company.
Buy approved electric parts and integrate them into your design. The whole unit does not have to be approved.
Most of the "DIY" lamp parts you purchase are already UL approved. Something like http://www.lightingdirect.com/international-lighting-pendant-kit-diy-pendant-kit/p2074236 with your pendant is usually OK.
Getting UL certification for a one-off design is waaaay too expensive. And the standards aren't really intended for that anyway. Use approved parts.
Getting UL certification for a couple of copies of a design is still way too expensive. Use approved parts, and buy the relevent UL standards to make sure you comply.
If you are selling wholesale, use approved parts, make sure you comply with the standards, then call a UL certification lab and get a price for certification. You should aim to get certification by inspection -- much cheaper than laboratory testing!
You have to PAY for a copy of those standards. Sometimes you can find equivilent standards that are free.