I'm really stunned (don't know whether in a good or in a bad way, probably both) that in 2021, beginners order fully assembled boards based on a random schematic entry with absolutely no prototyping!
You know, just some 2 years ago that used to cost around $500 and 6 weeks typical.
Even now, it still costs many orders of magnitude more time and money than it needs to be.
In other words, prototype! For prototyping to be efficient, you need to solder, use lab power supply (preferably with current limit) and use basic measurement instruments (a $10 digital multimeter carries you far). For simple designs (a few dozen components, without complex BGA/LGA packages), you often can work without a PCB at all to test if your ideas / circuit design behave in real world, so that once you order a PCB you have most of the things ironed out.