At first I was overwhelmed by so much text of detailed instructions, but soon found out that they are very helpful and easy to follow.

I used Patons 100% cotton 4-ply yarn and knitted mainly using JPN 4 (3.3 mm) needles.
My gauge: around 27 stitches and 36 rows after blocking

No modifications

All went well with no particular problems until…

After finished knitting, I soaked my sweater in soap water and then noticed that, although I was using cold water, blue dyestuff was coming out of the main colour yarn and transferring to the contrast colour yarn.
But when I rinsed the sweater in clean water, the stain was washed away from the CC yarn. Feeling relieved, I laid the sweater flat on a drying rack and went out. Several hours later I came back home and was shocked to see the CC yarn all in blue!

The sweater was still wet. I suspected the hot and damp weather had caused this disaster.

I quickly washed the sweater again with much soap, but the stain was hard to remove. In the end I gave up. Then, in order to avoid further staining, I used the washing machine to perform gentle dehydration for a short while, laid the sweater flat on the rack, and dried it using cool winds from the room air conditioner and a motor fan.

Now the sweater is dry. The stain still remains, but happily, has become less noticeable. I think I can wear this lovely sweater.

I’ve learned that I should be very careful about colour staining!
(Now I’ve found comments about trouble with colour-fastness in darker colours in the Patons 100% cotton 4-ply yarn page in Ravelry. I should have checked these comments before I selected this yarn…)