I don't know the exact model you have, but the turbo diesel D22 instructions for replacing the sump gasket - which is a single piece unit - are as follows:
1. Remove undercover
2. Drain engine oil
3. Remove front propeller shaft from front differential carrier
4. Remove front drive shaft fixing bolts (RH & LH)
5. Remove front suspension crossmember
6. Remove differential front mounting bolts (RH & LH) and rear mounting bolts
7. Remove front differential carrier
8. Remove front differential carrier mounting bracket
9. Remove transmission to rear engine mounting bracket nuts (RH & LH)
10. Remove engine mounting bolts or nuts (RH & LH)
11. Lift up engine. If necessary, disconnect exhaust tube
12. Remove oil pan.
There is a specific order to remove the bolts in, which probably should be followed. Easiest way for you to do this is to grab the D22 manual (it's a download you can find in a stickied thread, go in and grab the Zip file), open the service manual, go into EM.PDF and head to page 138.