Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: How do you iron a fitted sheet?
Document: Just fold it vertically a few times, until the entire sheet fits under the rotary iron. I never went more than a 4-sheet thickness. As the sheet was fairly damp, I had to put it through 4 or 5 passes to complete the job. At times, the machine made a concerning high pitched sound, when I put the twice-folded sheet through the rotary iron. It still worked normally.The results were terrific.
I love to sleep on ironed sheets and pillowcases and I can iron a King size sheet with the Miele in about four minutes. For optimal results you really need to dampen the cotton sheets prior to ironing - which I accomplish by spraying the sheets with scented linen water and seasoning in a plastic bag for about 15 minutes before ironing. The linen water (Vodka, Lavender & Peppermint essential oil mixed with water)really provides an aroma therapy effect.
One of my tablecloths would have cost $80.00. Napkins are $6.00. This isn't even the French style laundry in town who presses everything with a hand iron and charges $12.00 per shirt. I bought this machine from Amazon and I am very pleased with how fast and easy it is to press things, especially flat things like sheets, pillow cases, table cloths, and napkins. In fact, I can press the flat sheet and the pillow cases in less than 15 minutes.
It is difficult to iron fitted sheets because they get caught on the right side of the iron and sometimes can be a pain to unwind.My only issue with this machine is that it is clunky to move around. I was wheeling it across saltillo tile and one of the (plastic) wheel clips broke.
So, I was thinking to myself, "Are you insane? Two G's for ironed sheets? Do you know how many times you could have the laundry do that for you?". Well, it turns out that the answer to that question is "Not so many". The local Martinizing will gladly launder and press a queen sized flat sheet and four pillow cases for $56.74. And you know what? For $56.74 they do an OK (not great) job.
I'm always afraid I'll iron over a button and break it (just like you frequently get at the dry cleaners! ).I love this machine, it is a workhorse.
I bought this iron for my tablecloths. It easily irons large table cloths and napkins. It would be great for sheets too, if I wanted.Expensive, but very well made, it should last for years.
I would be sad to lose mine. Highly recommend if you like ironed goods, and like to iron then it's a great tool/toy. If you hate to iron then this might make it a little better but for the price you can send out a lot of shirts.
Received damaged in shipping. Local repair company came to determine what needed replacement. No word as to disposition on parts or whether iron is to be replaced,  So far, it is a very expensive DOORSTOP. It has never been used and sits folded and covered. DO NOT RECOMMEND because of inadequate method of shipment.
You can get better results if you are an expert with a hand iron, but it would take hours.The machine is extremely expensive, but it is clearly a solidly-built, quality appliance. If you really like ironed linen,shirts, etc, then it will definitely pay you back with hundreds of hours of saved-time, over many years.
Answer: It's not easy.  I iron down the middle...then fold it by bringing the corners together...then iron the folded edge.  It's not perfect...but it's not bad either.