Definitely go to Murano on your own to avoid the high pressure sales pitch. As Paul stated, do a google search for the companies/art galleries/factories that you want to visit and compile your own list. When I was there, I was lucky enough to tour through the back rooms of several private collections and showrooms, and never experienced a high pressure sales pitch, they were happy to share their love of glass with me. These manufactures are not on the "main drag" of Murano, but are represented in many of the art galleries. You can also ask the gallery owners to see if they could arrange a visit to where the chandelier was made (they have more pieces in their backrooms). One of my favorites is Toffolo Studio, however, his mini-chandeliers are a mix of traditional style and technique with modern. Cesare, his sons, and his wife have a different approach to glass, and use a combination of borosilicate (hard glass from Czechoslovakia)and soda-lime (soft glass from Italy). His working studio is above the gallery. Feel free to ask them when you're there where else you might go, they would be happy to help arrange the necessary introductions. The chandelier manufacturers will pack and ship for you, they even include several extra leaves and stems with your purchase (glass breaks!). These are family-owned (for centuries) companies and I would trust them completely to make sure your piece is packed and shipped appropriately. Places to avoid are ones that have glass made in China.