(1) To save money by getting the good dies from the start. Lee collet dies, Redding body dies and Forster bullet seaters.
(2) To know how to properly size your brass, just bumping the shoulder a couple thousandths. As mentioned by OP, holding press down a second or two to get a good consistant sizing stroke.
(3) Start with good brass. It will save you a lot of heartache.
(4)Spend the money on a good scope to start, cheaper in the long run.
(5)You don't need the latest, biggest super ultra magnum cartridge of the month to shoot a deer at 5-700 yards. I am a much better shooter once I downsized my cartridge choice (that's just me). I thought a .260 Remington was a kids toy 20 years ago, I was wrong. Lol.
(6)Be careful with online forum load data, every gun likes what it likes. Listen to their advice, do a little research to make sure their data is supported by a qualified manufacturer (Nosler, Hornady, Hogdon etc.) Work up to the load in increments safely.
(7)I wish I had this forum 20 years ago! There is vast amount of knowledge and experience here on this forum. Great group of people always willing to give some great tips.