Have you started on your build yet?
I'll be keen for some expert advice on the 1/350 Academy Titanic myself, I bought the kit dirt cheap from a local auction, I also bought the wooden deck upgrade, 3D printed funnels and PE parts which actually costed more than the kit itself
I think the most popular Titanic kit is the 1/200 scale Trumpeter, it's big and full of details and there's a 2020 kit released with new parts and tooling.
I've been watching a ton of Youtube videos, some dating from two years ago to as far back as 10yrs for the kit that I have.
For most videos I watched, the difficulty with the kit that I own was adjusting the kit parts for the photo etch upgrades (replacing windows etc) and the rigging, lighting the kit looked easy enough as there is lots of space in the hull and each deck to map out, mount leds and run wires comfortably.
Most builders recommended to start on the hull first, attach all hull related parts, fill in any seam lines with your favorite putty, sand smooth rough areas and prime then paint and seal the entire hull in it's designated color. Some builders even went as far as drawing out a template for the entire hull plating then cutting and laying each piece separately into their allocated patterned positions... I will pass on that detail.
Secondly, remove and clean up all bulkhead parts from the sprue including replacing all the windows with your photo etched parts (if you have any).
It was also suggested to leave all the smaller parts attached to the sprues then prime and paint them that way just so you wont lose any parts.
Dry fit then sub assemble in sections so you're working on one area at a time, I think most Titanic kits are similarly designed that way so that you can sub assemble.
The Titanic will be my second real life model kit attempt as I usually only build models from the sci-fi genre.
Here's a list of the upgrade parts I got for my 1/350 Academy Minicraft Titanic:
1/350 Academy Minicraft Titanic (search ebay or other hobby sites etc)
View attachment 96079
3D Prints
Funnels, water tight hatch, skylights, cranes, bells.
View attachment 96080
Photo-Etch
Hand rials, windows, doors, ladders, benches, seating, cranes rigging etc.
View attachment 96081
Wood Decks (search ebay, amazon, hobby sites etc)
These come with a sticky film backing but it is highly recommended to use PVA glue.
View attachment 96082
Here's a link to a build log which is great resource (not mine)
Build Log
Cheers.