if you want to downshift into 1st gear properly from 2nd to 1st, you will need to double clutch, then stomp on the throttle to get the rpm up as high as possible, then you engage 1st. i suggest you buy the sprintbooster if this is going to be a regular occurrence with you, otherwise you'll be eating synchros like a dog!

Also the 2004 6 speeds need to have the 1st gear synchro update, otherwise it will pop out of gear. i like this transmission myself but the word is that it came out of a truck, so maybe all the parts aren't debarred to exacting standards as say an NSX gearbox. but i like the notchiness myself, it makes the car feel more masculine.

but seriously practice your double clutching.