It is possible to trick yourself, and sometimes, tricking yourself can be beneficial. I read an article about how a young girl didn’t feel any pain when she got stitches. The reason she didn’t feel any pain was because the doctor tricked the girl (in a good way).
The doctor had a lot of coloring books. He told the young girl what colors to use to color the pictures. Eventually, the doctor would tell the young girl to use a different color. This got the girl distracted from what was really going on: the stitches.
The same girl who moaned about the stitches ended up not even knowing that the stitches even took place. The girl felt no pain. Her mind tricked her into focusing on the coloring books instead of the stitches.
I recently tricked myself by creating a book with a giant list. I ended up writing over 5,000 words in 1 day. The only reason I know is that I just happened to look at the bottom of the document to see my word count.
You can make the difficult things seem easy by tricking yourself. Then, when you realize you tricked yourself, look at what you were able to do. It really works.