It will get easier over time.
As mentioned, steering aids help. Don't be too proud. I didn't want fins. My wife - who rarely drives but would need to if something happened to me - couldn't keep the boat going in a straight line without them. I relented and bought Thrust Vectors. The difference is night and day.
I recommend a dedicated trip (or two) for "practice time."
We're too often consumed with the idea that "I'm out here for fun! Woo Hoo!" (which is the end-goal of course) to remember that boating is a skill you must learn and maintain. (There's a reason pilots get rated by TYPE of aircraft and must fly a certain number of hours per year in that aircraft to maintain currency.)
Normally, boating trips involve family, friends, food, swimming, and fun. The boat itself tends to be an afterthought - even though it is present the whole time. The reality is that no one wants to spend an hour on your boat while you practice slow speed maneuvers around marker buoys or approaching piers. (No real "Woo Hoo!" moments while that's going on.)
Spend some time on the water with just you and anyone else that will drive the boat. Take turns performing various maneuvers. Make the boat do goofy things. See how it reacts. Do it in calm water, do it in choppy water with wind. Approach a marker from all directions. See how close you can get. (Be careful - the Coast Guard and DNR don't like you messing with their markers so leave a wide margin of safety.) Make it a competition.
It's the same idea as teaching a kid to drive in the winter by letting them loose in a light-pole-free parking lot. You have to get INTO goofy situations so that you can learn to get OUT of them. Better to do it out on open water than 10' from a pier surrounded by other boats.
As long as you're out there, practice Man Overboard recovery: It uses the same skills maneuvering skills. Toss your throwable flotation device in the water and assign one person to be the spotter (the spotter should never take their eyes off of the "person" in the water while pointing to them the whole time). Now maneuver for pick-up. Consider how you're going to get your kids, your dog, or your uncle "Big Al" back in the boat if they are injured or incapacitated. Consider how they will get YOU back in the boat. (Now that my son is turning 16 and approaching me in weight (he's already surpassed me in height), my janky back and I have to figure out how I'd get him back on board. Thank God for a low swim platform.)
Put in some dedicated time to learn how your vessel behaves and those "Woo Hoo" moments won't be tarnished by too many "Oh S---" moments. If you do put an "apprentice mark" on her, don't worry about it. It can be fixed if it's bad enough. If it's small, then ask yourself this: Do you want a Trailer Queen, or do you want to go boating?
