Things I use - Hand blender, decent (enough for 12 puds) metal non-stick tin, plain flour, milk, 4 eggs, mixing jug, goose fat, pastry brush, fan assisted oven.
Tip 300mls of milk (cows, semi-skimmed) into your mixing jug, add 4 eggs and blend for 30 seconds. This should turn the liquid a light yellow colour. Next add at least 4 big heaped tablespoons of plain flour into the mixture and then blend again. Now this is the tricky (at least to explain) part.....the liquid needs to be at the consistency of a runny milkshake not too runny (like milk, but not too thick either)....after the 1st 4 tablespoons of flour add 1 more tablespoon (repeat as required) and then blend until you're happy with the consistency. When you're happy put this to one side (but not in the fridge).
Now heat your oven. I get mine to 220 deg C. While the oven is heating tip a small amount of melted goose fat into the non stick tin. Dip the brush into this and spread generously to every pudding tin. Once you have done this, put the newly oiled tin into the oven. Leave this in for at least 15 mins.
If your oven shelves slide out, open the oven and slide the shelf out with the tin on. Pour the mixture so it 3/4 fills each hole, at this point the mixture should be sizzling when you pour it in to the tin. If not, the tin isn't hot enough. You need to do this as quick as you can. Once all pud holes are 3/4 full, gently slide the shelf back in the oven, close the door, and leave it well alone. This can only work if you can see into your oven. After 15-20 mins check the puds, they should have started to rise by now. Once they are at the required golden brown colour, take them out and enjoy! This generally takes 25 or so mins at 220 deg.
If you're doing a big tin (for TITH) partially cook the sausages before you put them in the mixture, but repeat the above using a big tin instead of a tin with 12 puddings.
As a rule, for a Sunday roast I always cook the puds last due to the required temp of the oven. I find the time required for allowing your meat to settle, finishing the veg, doing the gravy and dishing up is more than enough to cook your Yorkies.......good luck.
I also recommend a good bottle of red (Yellow Tail Malbec, for example) helps you to cook a Sunday lunch, but this has taken years of practice!!!!