Moving to Japan on intra-company transfer, advice needed please

Hello, I did my own research before posting as per Reddit's guidelines and the most useful article I could find for my situation (UK employeee being seconded to Japan for a couple of years) is this one

https://globaltax.services/insights/how-to-move-to-japan-on-an-intra-company-transfer-full-guide-on-visa-requirements-and-tax-payroll-and-social-security-considerations/

Looking now for someone who followed those kinds of guidelines and best practices reported in the article to hear how it went on a practical level, what where the pain points experienced, anything they would differently in going through the steps suggested in the article I found?

Thanks in advance to those willing to help..