I agree fully on the manuals published by the bullet makers. Read them and fully understand what they are telling you.
If your simple Lee Loader is the style where you pound brass in and out of dies, be careful. Just my opinion, but they are basically only a neck sizer, meant for a few reloads on the cheap.. Soon you will need to be full length resizing which means a press. You will know if your bolt starts closing hard.
If you get to the press stage, hopefully you read the manuals and NEVER run a dry case into a sizer die. Put case lube on the list!
While reading about sizer dies, try to understand headspace and setting sizer dies. The basic instructions included with dies will keep you safe, assuming you have a rifle with a proper chamber.
Potashminer's story is a cautionary tale that you do not want to get into as a rookie. Know where your gun came from as far as its chambering and use either new, or once fired brass known to you. Do not get brass from your range's brass barrel.
Your mention of mouse fart loads is also scary. RYFM (read your f@@kin manual) and/or cruise the net. Lots has been written about bad results from attempts to load down rifle cartridges.
Get a balance beam powder scale, not an electronic. RCBS 505, 510, or equivalent are readily available.
Get a decent dial caliper and learn how to read it. This is not hard and there are no batteries to fail.
Get a hammer type bullet puller and a piece of 2x4 to pound against. Do not whack them against a concrete floor. When you start learning how to set your sizer die and set bullet seating depth, this tool will let you get things adjusted without powdered or primed cases. Just like trying on shoes.
I could go on and on, but others can chime in. Read the stickies at the top of the different forums, there are several good cautionary tales to be found.
Happy and safe reloading.