Short answer, yes. That’s how I did it. Bought everything individually. I looked through the parts manuals and looked for differences between the auto and manual. Mechanically, it’s pretty simple. Electrically, it’s tough, especially since you have an 05. You’ll have to change the pcm to one with a TCM in it. I don’t know what the harness differences are in the last two years.
Spend lots of time looking for those differences, then look again after you’re done. I missed a couple things, and I spent hours pouring over posts, talking with Blaine, and studying the manual.