The Core

Apprehensive, yes.  Could be an $8.8 Billion fireworks show.

Welp, so far, so good.

When the telescope was about 100,000 miles (160,000 km) away from Earth, the observatory executed a crucial burn to ensure it would safely reach its destination.

According to NASA, this burn, dubbed Mid-Course Correction Burn 1a or MCC1a, was the most important of the three burns the spacecraft will make during its journey to the destination --Earth-sun Lagrange point 2-- and the only one that needed to be particularly carefully timed.

Nice animations. I was listening to radio coverage of this last night while driving around.

One thing to highlight is that the JW is going into orbit around the sun 1.5 million km away from the earth. I found this interesting, especially the comparison to other objects (Hubble, the moon, etc)
https://webb.nasa.gov/content/about/orbit.html

Dec 28:
JWST will deploy its mirror flaps around 12 to 13 days after launch. But before that happens, the observatory has an even more complex deployment that it must get through, one that will take up to six days to complete. It's the deployment of JWST's sunshield, an intricate apparatus designed to block heat from the Sun and keep the telescope extra cool while in space. While the deployment process is designed to be flexible and things could change, the first step of the sunshield deployment is supposed to get started today, which means almost everyone associated with this mission will be holding their breath for the next week.

"The sunshield itself is — of all of our deployments — that's the one that is the most complex," Lee Feinberg, the optical telescope element manager for JWST at the NASA Goddard Space Flight Center, tells The Verge. "It has the most moving parts."

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>European Space Agency

The Ariane 5 rocket has one of the widest payload fairings currently on the market, spanning 5.4 meters, or nearly 18 feet wide. But that’s still too small to house JWST’s mirror fully extended.

https://www.theverge.com/2021/12/28/22816310/nasa-james-webb-space-telescope-jwst-deployment-sequence

Aft Sunshield Pallet Deployed

https://blogs.nasa.gov/webb/2021/12/28/aft-sunshield-pallet-deployed/

Sunshield Tensioning Complete. JWST Sunshield is Fully Deployed