I have only worked on 1 Husqvarna to date – a 2015 501FE.
Depends on how mechanically-experienced you are in general. If you’ve ever worked on a car or another motorcycle you’ll be in decent shape. If not, there’s a ton of small things to know, especially with a motorcycle so new and electronically fancy. Lots of procedures and even some tools are model-specific.
In general there are a few things I’d say: buy torque wrenches and learn how to use them or you will be breaking a lot of fasteners. Get a service manual for your motorcycle if one exists, and refer to it frequently; they often have a section for beginner mechanics that explains many things you need to know. They also contain accurate reference information you can read faster than I can reply.
Here’s the bad news: good suspension is not cheap and there’s no way around it. Especially custom or lowered suspension. Often it’s cheaper to have a seatbuilder lower or change your seat via a rebuild than it is to buy a custom shock. You have to change both ends of the bike to match if you lower one end. How tall are you? What’s your inseam relative to the seat height? I see a lot of beginners saying they want to lower their motorcycle because it makes them feel more comfortable at lower speed, because they can’t get their entire feet flat on the ground – frankly if you can get the front third of both feet down on the ground while sitting that is enough to balance. If you’re shorter with a shorter inseam than the test rider the machine was designed for, that’s understandable and custom suspension or seatwork may be in your future.