Breaking in is part and parcel for these boots. I don't know if there are anyone had smooth good time from day1. Wear the no4 green socks with them. IMO they are the best match. Even Red Wing brand socks are much thinner, so no use buying their socks.
Do trust the staff at OGW, I find they are pretty professional so far. No pushing sales, and always giving humble suggestions. Last year I almost wanted to get a Beckman though i wear a size6 and they only come in 7 locally. Han described to me it will be uncomfortable, and told me to hold back because there are news of something similar (flatbox) releasing in 2017. Then when i was buying my 8106 in June this year , one of their lady staff was helping me pick the correct size; either 5.5E or 6D. She was very patient helping me and giving her opinions. I wanted a 5.5E actually (same size as my 875), but she thinks likewise because according to her the 6D should mould nicely to my small wide feet instead. I listened to her advice bought size 6D, and never regret I did.
Btw, I never wear insoles for my pairs too. Let the leather insoles mould to the shape of your feet.
of course, above are some of my personal experience and 2 cents worth, the decision is in your hands.