Agree with 3killerBs on size of crate. 3x2 is simply too small, even with a heat plate.
I used a modified 6x2 crate for 5 standard size chicks and by the end of week 2 they were zinging around, outgrew the space, knocking over feeders. By week 3 they were in the coop grow out pen with...
Yes, it can be done. First day or two, if you can swing it, plan to be home.
Get a routine down. I had two feeders and waterers, one set in use and one set ready to go the night before. Takes 5-10 min in the morning to clean, feed, check health.
I set up a ring cam and monitored from work...