This job requires special tools and special training. If you lack either, you risk SERIOUS personal injury. Injury comes VERY EASILY!
You need to address oil levels, proper and legal refrigerant recovery, system evacuation, and recharge.
You were planning to also replace the receiver/dryer, correct? It also needs the oil in it measured and incorporated into the amount of oil (in %) that would need to be added. FAILURE to address these and other issues will guarantee premature system failure and likely compressor damage.
Take this job to a qualified shop.
Sorry
Adding freon to the low side of the system is not dangerous. The most you can do is put to much in and the compressor will shut off.
In order to find the low port just follow the ac lines. You will find 2 ports and they will be different sizes. The connector will only fit on the right sized port. I would recommend at least using a good set of gauges because the ones that come attached to the cans of freon are junk.
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