We used to put our DTs in their cot, put a lullaby CD on as their sleep cue (for night time and naps) dummy, muslin next to head to snuggle up to (they really like this), then lots of shhhing next to head, stroking face, stroking downwards on bridge of nose etc. Any soothing, calming sort of stuff.
Sometimes a change of postiton worked for some reason (trapped wind perhaps) like rolling onto side for a minute then onto back again.
We rarely picked them up once down. Luckily they never got really hysterical, just sort of mild crying and wingeing but it was hard.
It was so worth it because now they go out like lights at nap and night time. Lullaby CD, dummy, muslin, sleep.
We cracked night time first, then once I decided that they needed more substantial naps in the day, rather than that constant napping of newborns ifkwim, I tackled daytime naps. Staying in for a week like you suggested was useful to get them used to the cot in the day time. At first I couldn't get more than half hour or so out of them but it has gradually increased until they go for hour or hour and half during day. They have extended the daytime nap on their own somehow!
Can still be a bit hit and miss sometimes but we are definately getting better and life is getting easier!
DTs are 8 months btw.
Hope that helps and good luck!