McFarlane arrived in the summer from Southampton and took on the post after Filipe Coelho left for Strasbourg.
He told chelseafc.com: "It’s been really enjoyable. Of course, it’s been challenging too. A lot of the lads and the staff, myself included, haven’t experienced this kind of schedule before.
"It’s intense. You’re basically preparing for a game every three days unless there’s an international break. That means we’ve had to be really creative with how we manage the schedule. Our focus has been on getting the players ready, keeping them sharp and making sure they’re physically and mentally prepared for what’s next.
"So yes, it’s been tough, but really rewarding. There have already been some great moments in these early weeks."
McFarlane added, "The way we started the season really stands out. We won our first three league games, which gave us a strong platform.
"The performance against Manchester City was a particular highlight. Beating last season’s champions with real control and style set the tone and gave the players belief that they can compete at the highest level.
"Coming back after the break and playing Bayern Munich was another great experience. The players loved the occasion and embraced the challenge."