Golly, must be dozens of prior threads on this same topic (pays to check such - saves waiting for replies to come in).
Anyhow, the usual & per prior replies is as follows (and if you've not backed up the tractor to the implement in relative alignment to the pins - what follows won't work):
1. pull out sway bar pins to allow lifting arms can move freely
2. align non-adjustable lifting arm to implement pin first
3. align the adjustable lifting arm next (crank up or down on an adjustable cylinder crank as needed; lean against or pull on rear tire if a bit off in a forward/rear direction; if tractor is too heavy and you've a FEL, put the lower lip of the FEL blade on the ground and then you can move the tractor a few inches either way using the FEL control - the latter wonderful idea is NOT mine - posted by another on this forum)
4. connect top hitch IF it doesn't get in the way of your access to the pto connection
5. connect pto (make sure it's lubricated - the heavy ones can really be a bear to seat on the pto shaft)
6. raise implement, center behind tractor, put in sway bar pins
Yup, level ground and implement dollies are wonderful, but I ain't got either (yet - - - building garage now).
When in trouble, a crowbar is magic (so is a large hammer)