If you're not water cooling with custom loops, it's pretty damn simple but there are a few mistakes you could potentially make, like with dropping screws and not finding them and then blowing out the PSU...which may or may not have happened to me. Tip: buy from amazon.
Just plan it well, make sure the parts are compatible. Should be a few hours at most for a first timer. Probably 2 hours if you want it nice and tidy.
Look at the arrow in the corner of the CPU for orienting it so you don't have to get out a blade and reallign the bent pins.
Read the relevant section in motherboard manual for certain parts if you need to. Like which RAM or sata slots are fastest etc.
Make sure you plug the display cable into your graphics card and not the on-board video card like someone did on christmas and made a thread about. He hadn't taken the plastic plugs out of the back of the GPU and was telling us there is no other port and his kid is sitting there dissappointed! (It was a pre-built setup too).
Use an X shape for the thermal compound on the CPU. I watched a video where someone placed a clear acrylic square instead of the heatsink on the cpu and tested different shapes. It wasn't this one but I can't seem to find the actual one:
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The original X I saw was cleaner and a bit longer than how this dude did it and it came out perfect.
Also there's this
https://www.pugetsystems.com/labs/articles/Thermal-Paste-Application-Techniques-170/ which has the same finding - the X is slightly better. Their X wasn't that clean either. Just do a clean X, with longer lines than you might think, but not too thick and you should be good. It's simple enough to remove it with isopropyl alcohol if it gets everywhere.
Make sure the case you buy will fit the components you want to put in (with a heatsink/fan, gpu), and potentially add in the future - like more hard drives. The Noctua ND-15 is a fantastic air cooler (mines been running since 2014 and I plan to keep it going for another 10 or 30 years!) but it's huge and
might not fit if you got a smaller case - though I think there is a smaller factor version available. Some GPUS are really long too.
It is easy but there are potential mistakes, just needs a bit of planning. Once you have the parts, just take your time, it's absolutely do-able.
And if your case doesn't have the risers for the motherboard already attached, make sure you don't attach the motherboard directly to the case, but to the risers.
Think about the direction of the airflow and that's pretty much it. Watch a video or two on youtube before you do it and have at it.
Might be worth building it all on some cardboard before putting it all together in the case to make sure it works and you know where things should go.
Touch the ground every now and then to make sure you don't build up static by rubbing yourself on carpet.
