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The post saver tip is a good one. Don't use postcrete, it has the structural strength of wombat shit. Dry mix a 25kg bag of ballast with a heaped shovel of cement, one mix per hole. Whack it down hard around the post, about 2 shovels at a time, using a broom handle or similar, no water is needed as it will draw in ground moisture. A post level, available from Screwfix or most builders merchants for about £4 is helpful. Not all panels are created equal, so use an actual panel to position the next post.
I'm going to hopefully be putting up a fence at the end of our garden this weekend (assuming I can clear the area). I have 4 x 8', 4"x4" rounded top, pressure treated posts and 3x 6'x6' trellis topped panels to go between them. My plan is as follows, let me know if I am missing something;
Clear and level area
Treat bottom 3' of posts (but what with? is it even necessary if they are pressure treated?)
Dig first post hole as close to neighbours last fence post as possible (one neighbour has 6' high fence, planning to start from there and then overlap the other neighbour's 3' fence if necessary - I've check and this is OK).
Dig hole 2' deep (google tells me a post sticking up out of the ground 6' should be buried 2')
Stand the first post and use Postcrete to anchor (following instrucitons, and advice from a mate - that should be fill the hole around the post around 2/3 with water, dump in postcrete, secure post plum with scrapwood).
Measure off first post 6'2" to centre the next hole.
Rinse and repeat.