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With experience, well built and fine tuned helicopter, once can gain confidence and team up, like with a horse. Find my video, where I let it go almost every time once given the direction. Just smooth inputs to tell the intention. Per example, the high speed low passage over the field was done with almost no correction once altitude settled by ground effect. Just let it go, until deciding to quit the manoeuver.

Painting fuselage
I got a lot of experience from my first scale build. Among others challenges with painting. In what order to paint inside /outside / detailing etc. But biggest problem was to choose type of lack. I started with an alkyd paint but was not happy. A tiny fragment of dust left an “island” of non paint area and a lot of frustration. If you was heavy on the spray can the lack will move downward, and you are back to start.
Then I tried nitro cellulose lack that works better. Just that you can not mix this lack and alkyd lack because NC lack dissolves the underlying lack. It is hard to touch up NC lack with a brush, because the fresh lack will dissolve the old lack and just make mess.
So people out there, what are you using that is giving less headache?

The United Nations Humanitarian Air Service (UNHAS), created in 2003 at the request of the United Nations, provides common air services, including light cargo transport for the wider humanitarian community to and from areas of crisis and intervention. To fulfill its mission, UNHAS uses a fleet of 75 aircraft and helicopters chartered from commercial air operators. Here is the Bell Twin Two-Twelve in action.