i just got mine last week. I dont know your background but Im going to go off the presumption that you dont have a big background in Mech or walking mech. Think of it as a light armored fighting vehicle with legs.
Ive built the Wave and Nitto kit, and they have their typical issues of puttying seams like every other kit.
the Mk 44 is a Hase kit, and I expect Hase level of engineering on it. With the many Gundam kits i have built from Bandai (Master Grade kits) there is VERY little putty used---this is my expectation on this kit.
My advice....enjoy the kit. This is a split suit kit , which means that it opens up for driver entry. Determine if you want to go this route, or more of the "buttoned up" look. Mine will be split with two drivers talking to each other.
Follow the insructions--they are clearly laid out, and systematic. I always tart with the feet and work my way up. Use an egg carton with labels so you know which is the left leg, left foot, left arm, etc.
I always use liquid glue, and Tenax 7r is my new favorite applied with a small brush. I also use Tamiya thin liquid and Testors liquid. Given the engineering of this kit I expect it to fall together.
A word about the locator pins--on Gundam kits they are supposed to be a tight press fit, and othr than the hips which I always glue for extra strength. I always cut my locator pins at an angle, and cut them short so I can get it apart for panting individual parts . I glue anyway even tho they are supposed to be press fit. I just run glue along the seam, and it seeps in.
When it comes to weathering, paint and weather it like armor. Im not too hot on the kit paint schemes. MOST Ma.K. uses WWII style paint, especially Luft style paint for the Strahl ground forces. The mercenary forces use this WWII paint style too, but tend to dress their machines up more (like the SAFS Snowman) I will play with some colors and find out what I like, and use the provided sheet as a mix and match for the way I want my Mk44 to look.
There are a couple of great sites out there and I have links in my own uild topic here in this forum. They are helpful and inspirational.
have fun with it, and dont let it sit in the box. Build it--you will learn and have some fun at the same time.