Torque-wise, you'll be fine if you just get them in fairly firmly with a 3/8" drive ratchet wrench. Don't use a 1/2" ratchet drive handle which due to its greater leverage could easily overtighten the plugs and strip them out. Also use a minimal amount of antiseize compound on the threads so none get onto spark plug gap area. Also, remember to thread the spark plugs fully in with your fingers before using the ratchet wrench on them. That prevents cross-threading the threads.
Finally, your newer distributorless engine is fairly fussy about its spark plugs. If you want to use platinum plugs for their significantly longer life, be sure to ONLY use a double-tipped platinum plug which means it has the platinum coating on both sides of the gap. A single-tipped platinum plug will eventually cause problems.
Two very good double-tipped platinum plug models that run very well in the newer 4.0L engine include the Champion 7034 or Autolite APP985 (NOT the AP985).