Buying prewired LEDs is ok if you don't have many in a build.
If a build has many,it can get real expensive fast. I buy in bulk for those builds.
I just finished the TOS Enterprise Bridge and it had tons of LEDs and LED tape in it.
SMDs are not hard to solder once you have some experience with them. A microscope makes it much easier.:grin2:
Through hole LEDa are a piece of cake.
I ordered a 100 of each color and size to keep on hand.
I buy them without wires. Before I start a build I make sure I have enough or else I order them.
That way I am not waitng on them. I try and order from Hong Kong because they come much quicker than China.
I also have a good selection of resistors on hand. I like to get them from allelectronics.com. They have a huge selection and arrive within a week or less.