I've been building wood furniture for about 25 years so it was very easy for me because I've got all the tools.
If you've got the tools and time it will be easy
You need to design your tank at first before you can built anything. The only things I bought was the log, the glass and the water...
As my girl likes to dig around, I decided to built her a hide with a sand pit at the back for laying her eggs.
This is how it ended up with work in progress
The final hide with pit