Following this project with great interest, I don't want to build a desk myself but would love to get into carpentry!
Do you have a list of tools you're using for this project?
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Titan pillar drill. Not essential, but it is handy for driilling straight. I have a cordless Makita drill/screwdriver which I use occasionally as well. There's a 9mm drill bit in there right now for helping with the 9mm mortises. You can also see a marking square and tape measure to the left for measuring and marking and (trying to) keep things square.
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Makita mitre saw. Probably essential I'd say, for cutting every piece to the right length quickly and accurately. I can't cut straight by hand to save my life, and even if I could it would be a lot of work. If I was to buy a new one, I'd probably look for one with a sliding arm, so you can cut wider pieces than the blade alone would allow.
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Evolution table saw. The newest and biggest tool I own. Haven't used it extensively, but I don't think I'd have been able to cut the tenons without it. Probably essential for any quantity of "real" woodworking.
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Makita router/trimmer. Essential. I don't own a full-size router, but this has done everything I really need up to now. Very handy gadget. Use it for cutting grooves, mortises, and a variety of edge profiles, though I tend to stick with a simple 1/4" round-over on most things I make.
And then a variety of hand tools for smaller or more intricate tasks - metal ruler, marking square, tape-measure, hack-saw, chisels, files, etc. Some essential, some not - depends on what you need to do.
On the software side, I spend ages fiddling in Sketchup before cutting anything! I keep meaning to learn something like Fusion360, but haven't got around to it yet.