Q:

The Colonist - Part II: Landing

This is the second part of a series of questions I'll ask about a self-sustaining colonization ship. I'll keep editing this post as things unfold.
If you can, check out the other questions of this series for a bigger picture:
Part I - Construction

Some Context
Each Colonist journey is a one way trip to a new world. There aren't resources or space enough for another 20~200 year trip back, so the people in the ship (about 100 individuals) must be equipped with whatever they might need to start a new civilization from the ground up.
The original idea is that these giant vessels are not meant to come back home, they're meant to BE home. And this is the main point of this question, since every Colonist must take the passengers to the new world AND serve as a first base of operations to aid them in the creation of a new colony.
Once the Colonist reaches its destination, it will enter the planet and make a landing - after a geological survey to find the best landing place possible, they set the coordinates and start to descend into their new home.
However, this ship is massive and I have doubts about how feasible it is for this landing to take place.

The Question
Taking into consideration the massive ship discussed in Part I, I'd like to know:
Is it possible for this ship to safely make this landing?
Things to consider for this question:

The destination planet is exactly like Earth except unpopulated;
The geological survey is but a BS excuse. I'm basically saying they'll ALWAYS find the perfect landing zone;
Safely means no casualties among the crew - but the ship and the cargo can be damaged during the descent;
The world can't be damaged enough to become uninhabitable (this is here because I've been told that a large enough body might actually burn the world's atmosphere - which is something that a terraforming crew obviously does not want);

A:

Why land at all?
You and I live on a planet. That's what we are used to.
But these colonists have lived for decades (centuries) in a finely-tuned space habitat. It seems temporary to us...but for them the habitat is 'home'.
They are in space, near a new star (source of energy), with plenty of asteroids and moons and comets at hand (resources). Everything they need to build new orbital habitats and maintain the life they are used to.
Some adventurous folks and scientists are likely to climb down the gravity well to the attractive earth-like planet. There might even be some outposts down there for various reasons. But civilization and the bulk of the population will be space-based, just like their ancestors.

A:

I think it is possible. Considering that the initial period after landing will be the most harsh, having to rely only on carried along resources, I would opt for the strategy of:

While carrying out the survey, park the ship in orbit around the planet
Disassemble the ship into smaller modules, each equipped with heat shield and parachute, and fit it as a self standing building.
Land each module independently

In this way a problem during a landing procedure will compromise only a fraction of the total set of structures, and, even accounting for different landing locations, it will be easier to move a small module than a large ship, should it be needed.

A:

Plan to land only what you need
Much of the colony ship has no reason to land.

The stardrive and its fuel tanks
Maneuvering thrusters and their fuel tanks
The shielding
Command and Engineering
Air recycling (you might want water and waste recycling)

The list probably goes on for some considerable time. There'll be large amounts of empty space formerly taken up by stores for the journey that's just not needed any more. All of this extra mass and volume would need to be shielded for re-entry greatly increasing the amount of mass unnecessarily being hauled across space. So plan to leave it all in orbit and only take what you need. The rest of the ship can stay in orbit as your first communications satellite.
Eggs and baskets
Don't keep all of the former in one of the latter.
While you're sending three ships, entering an atmosphere is a very high risk activity, the fewer of your eggs you have in each basket the safer you're going to be. Break required parts of the ship down into separate re-entry modules, no more than one critical element in each pod. Make sure you don't lose too much if any one pod is lost.

