Its easier the first few times lifting it but once youve done it a few times you can do it on the ground - its a question of knowing what tools work best (If your stuck I will dig out the ones I use). as far as filling it goes the level is correct when it stops coming out of the top hole on level ground - so I usually slightly over fill it and leave it with the drain container under until it stops running back out!. I use a long pipe with a funnel at one end and an angled Au tube at the other which has been cut to jam in the hole. Good luck its very doable
Thanks. This is very good information.