Without a ramp or pit, you need to put the front on axle stands. End of story.
Bolt/nut torques are all in the workshop manual
Important things are to make sure you fold the tab washers over the turbo nuts AND HAMMER THEM IN TIGHT AGAINST THE NUT WITH A SCREWDRIVER. Also, make sure you check the mani nuts every few days for a week or so after fitting.
My advice for the elbow to turbo is the use COPPER NUTS. I will almost guarantee they won't come loose
Finally, take it easy undoing the mani nuts. Soak them in WD40 the night before. If any stud is going to shear, it'll be one of those...