The way I do difficult junipers like pfizers is as follows:
- Get shopping, make sure you own 50+ trees. In my country, I can get roughly 20 garden store plants for the price of one bonsai starter tree.
- Go back to your juniper.
- Wire the trunks, all of them. Bend the heck out of them.
- The juniper then starts talking when you look at it from different angles, it'll tell you what needs to be removed. Do that. It'll tell you which one (or two) of those three trunks need removal.
- Optional: Regret your choices and leave it be for another year. In the mean time, work on those other trees.
A year later:
- Wow, this thing is actually pretty nice, I see something here!
- Repeat the process, this time wiring finer branches too. Optional: Get bored, work on something else.
Halfway through summer you're going to realize this tree has potential. Foliage will show explosive growth. Continue wiring and bending.
Remove the wire if it bites in too much, rewire the trunk in fall. Branches too if needed.
Year 3: boom, you have a great tree to work with. All weird wounds from bending have basically healed. Growth has doubled since the start.
Pick a front and continue from there.
That's just an example from my blurred mind at work. But slapping heavy wire on juniper trunks that don't immediately show possibilities seems to help most beginners.
If it were a kishu, itoigawa or blaauw cultivar, I'd recommend air layering some branches off. But pfizers are so cheap around here that it's cheaper just to buy another one.
