Obviously the first thing you need to put on is the bottom fitted sheet.
Firstly tuck the top right corner of the bottom sheet under the mattress, then do the bottom left corner; or vice versa. Then move on to the two corners that are left.
By doing opposite corners, it stops the bottom sheet from being tucked over too much on the one side, as it pulls the sheet evenly across the mattress.
Then you move onto the pillow cases. I usually put two pillows into one pillow case (Makes them seem chunkier) So they're much more comfortable.
Pull your pillow cases inside out, then reach into the cases grabbing the two corners with your hands. You then hold the two corners of your pillow with the same hands that are inside the pillow case, and you stand up and tip them upside down to give them abit of a shake so as the case can fall over the sides of the pillow. You then just pull the remaining piece of material over the rest of the pillow with your hands.
That same method applys when trying to put on your duvet cover.
After all of that is done, you place the pillows in the correct place, put the duvet on the bed and tuck in the corners.
Add some cushions onto the bed or teddys to make it look more welcoming if you wish. Or maybe even add a throw at the end of your bed.