I store my comics in comic drawers standing up and with dividers. I use Mylar 4mil with full backs (Acid free), Dark dry location. The goal is to not get into the habit of pressing. If one item needs it then try it. I believe Hero Restoration might do it. He features his stuff here all the time and it's great to read and see the progress. I don't believe Susan at the Restoration Lab does pressing as a single option.
You should get into the habit of learning the difference in grades. Plenty of 9.6~9.8 are really 8.5~9.2. This will allow you to make educated purchases. Sometime you see something you would love to have but are blinded
to what you really have in hand. If you are buying then you need to decide what category you trying to fill. Collector, Investor, Merchant or something in between. Many of the collectors here buy, read and are happy with the find, sometimes rescuing something from heading to a garbage dump. The Investor wants the best so that it makes money for them, hopefully, one day. The Merchant is in the business of flipping the thing (buy low sell high).