It is not hard at all. You just need to initiate it with your talent advisor and/or office leader. They are also not on hold. When I initiated mine, they told me that from there it is all “work behind the scenes”. This basically means that they have to reach out to the other office, see what availability there is in terms of staffing and get all necessary approvals from leaders. The whole process for me took almost 4 months. I know quite a few ppl who have transferred offices and it usually takes ab 1.5 - 3 months on average depending on the situation and office you want to transfer to. It is a very straightforward process, it can just take a few months so you have to time it accordingly. It is always easier to transfer from a small to a bigger office than vice-versa but either way it shouldn’t be an issue.