Just warn people when you start the run and ask them to help you out if you get lost. I started the game as GLD/PLD and was constantly running into the same problem (and my PC was a POS), so I switched to BRD. After you run the dungeons a few times the path will kind of become second nature and then you have to started paying attention to mechanics. Now that I have a new PC I have started to play with PLD a little bit again and still have the same problem on the dungeons I haven't ran in a while. Just do your best, ask questions and if people have a problem, let them kick you and just ride that tank instaQ. Ifrit is just story/game progression but one of the best low level roulettes because it's usually a quick easy fight and it will give you your first taste of some of the HM and EX mode mechanics later on.