I have a 2018 awd. I recently was driving and all the transmission oil leaked out and the transmission stopped shifting. It is leaking where the engine and transmission mate together. I filled it back with oil to see if it would shift and it still won't shift. There is a bad smell of burning clutch. I'm looking at replacing the transmission myself. I work on heavy equipment for a living, just not very experienced with the passenger car stuff is this a pretty straight forward job? Is there any tips and tricks I should know before digging in? TIA