Hi. If you like Ill share a few quick tips gained from my recent TD5 rebuild (ignore any that already apply to you!)
Be organised, bag and label everything that comes off the engine.
Clean and inspect parts as you proceed, put cleaned parts into new clean bags.
Dont throw anything away (including gaskets) until you have the replacement part to hand, this is to check the new part is correct.
Have a clean, dry work area, consider renting a garage if you dont have one of your own
Clean oily parts over a catch tray, dont let dirty degreaser go down the drain/road gully, this also stops you getting your driveway all oily and smelly (keeps SWMBO happy!)
Take pictures as you go along
Print out pages of the manual that you will need, read them thoroughly, really get to know the manual.
Work clean!, wear gloves if you can, this is important when doing the reassembly.
When reassembling always do a final wipe over of parts with a lint free cloth (microfibre) dirt cheap from Tesco etc.
If you have any parts machined, wash them very carefully when you get them back, they may have lots of swarf hidden in pockets/crevices.
And finally, not that im obsessed or anything.....work clean!
Good luck!
Mark