Then I recommend a progression where you start relatively close to the net [5' away] and simply work on getting comfortable with the swing. Don't try to hit winners, don't try to bounce the ball over the back fence, don't try to hit extreme angles. Just a consistent, steady, 60% power stroke. The feeds should be "OH friendly", meaning you don't have to move too much [yet].
Once you're grooved, move back to the service line. Get the groove again.
Then, have the feed increase in difficulty. Work hard on footwork and positioning because these are where most errors are made.
The advanced part is the scissor kick and hitting OHs even though you might be more than halfway between SL & BL and fading over to your BH side.
Note that you can do this against a wall: it will be awkward at first because it takes a certain type of stroke to keep the rally going. Hit the OH down on the ground but close to the wall [within a few feet: the further away the contact point is from the wall, the flatter the trajectory of the rebounding ball and this isn't going to simulate a lob]. You'll have to experiment. And hit very easy at first to gauge the rebound. The taller the wall, the easier the drill [you might find yourself bouncing your OH over the wall otherwise].
Once you get comfortable, you should be able to continue a rally for 10+ OHs.
Even better, find a practice partner who wants to work on their lobs. And make sure to eventually switch positions.