nah!
while I would never say DON'T use a pre fab hopped extract, heck, I made multiple batches like that starting out, I honestly enjoyed the process more using a multi step recipe...and, in my case, I enjoyed the final beer more than most of the HME based ones.
here's all you need to do breez:
I will assume you have. at the least, an 8 qt (so 2 gallons) pot for this.
put a gallon and half of water in there and turn on your burner
as it is heating, stir in the full 1 pound of amber, and 2 of the 3 pounds of light dme (seal and store the rest for another batch). it will take a bit of mixing, but you will eventually get all the clumps out and have a beautiful wort in your kettle
keep an eye on the pot because you don't want it to foam up and spill out making a huge mess!
once it comes to a boil, add 1/4 oz of the centennial hops (just toss 'em in) and start a 30 minute timer (you are doing a partial boil, but that is perfectly ok for using extracts)
with 20 minutes left, add 1/2 oz of the cascade hops
with 10 minutes left, another 1/4 of the centennial
with 7 left, another 1/4 of cascade
take the remaining hops and put them in a ziplock bag and store them in the freezer
timer goes off...flames goes out...boom. dun-dadda!
doing small batches that you need to top off anyway, here is a speed chilling method: use ice! put a bunch of ice cubes in the bottom of the demon, then pour the wort on top. it will immediately drop down to a good level. probably even under 100 degrees. use more cold water and ice to fill the demon up to about 2.5 gallons (it can handle it). if the temperature is between 60 and 70 degrees, you are ready to pitch yeast.
simply use a whisk (trying not to hit the sides of the demon to prevent scratching) to aerate your wort for like 30 seconds, then sprinkle in the yeast. let it sit for about 10-15 minutes, with the lid on, to rehydrate. then whisk again for another 45 seconds or so, put the lid on. then walk away for 11 days. no touchy! leave it in a spot that is cool enough to keep the wort under 72 and above 60 degrees. US-05 is awesome, and it can handle anything in that range. just keep it as consistent as possible.
after those 11 days are up, there is a 99% chance everything has been done and over for days, and that is a good thing. now, remember the leftover hops? go get 'em, and dump them all in to dry hop for 3 days. most will settle out, but if they don't, no worries. a little fermentation schmutz in the bottle won't hurt anything.
then (after 14 days total at this point) go ahead and bottle with priming sugar. let those sit another 2 weeks in a relatively warm area. then put them in the fridge for another 2 weeks (ideal), but I know you will be antsy
so give a bottle at least 3-4 days in the fridge for the CO2 to be absorbed. trust me here. and if you can wait for a week instead, it will be all the better
oh, the vital stats on your EZ Breez-Y APA 2.5 gallon batch are that it is 6% abv with 40-45 ish IBUs
it might seem like a lot on your screen, but that is basically the whole thing soup to nuts...I think you can handle it!