If you decide to skin-pop the pills, I would do the cold water extraction to avoid all the apap. Skin popping has reporedly produced results slightly better than orally (according to erowid). If you snort it, I would recommend doing the CWE, but then keeping the solution away from heat and sunlight until it dries into a fine, snortable powder. APAP is hard on the nasal passages. This powder can also be taken sublingualy. Snorting drugs usually gives them a quicker onset, but less latency. Codeine is usually tolerated very well orally.
Will it kill you to take 2 grams of apap at once? No, but I would make a habit out of it. Anything over 1 gram at once or 2 grams a day WILL cause liver damage, however small. If you exceed 3 grams at once or 4 grams a day you will be at serious risk of liver damage because your liver runs out of the enzyme that breaks down acetaminophen- you overwhelm and choke it. The enzyme that breaks down APAP is sold as a supplement, so you can take it when you get high just to be safe.
60 mg of codeine usually isn't enough for even first time users to get high. I would try 180 codeine your first time, but 150 might do the job. Tylenol #3's are usually CWE'd because of their low codeine content. #4's are really the way to go