You take a deep breath, get there at opening, and have a BLAST!! DLR is sooooo much more low key and easy than WDW! You can’t grt FP’s until you are inside the park, either by walking up to a FP machine in front of the ride, or by paying for MaxPass (totally worth it for FP’s btw!)
FP’s are very easy to get because no one can prebook them and you can only get one at a time. If a particular ride is a must-do and popular then I would go to it at rope drop and get a FP for another must-do while you wait. (Just please, do us all a favor and don’t do it while you WALk! Lol) You can easily get FP’s throughout the day for most rides, unless it is a very crowded day. When crowds are high some popular rides will run out by mid morning, or early afternoon. I’d say the hardest one to get is still Radiator Springs.