You did not answer my question about whether you have experience growing plants in pots. It helps knowing how much experience someone has. Filling in location on your profile also helps. Much of the tree specific advice requires knowing what the outdoor weather is like. This is an international forum, it makes answering posts easier if you know whether someone is in Atlanta, Kansas City, Anchorage AK, Christchurch, New Zealand, or Singapore. We have members from New Zealand and Singapore, It is early autumn in New Zealand. They are getting autumn colors on their Japanese maples. If you are growing indoors only, or under lights only that could be used as a location, as it makes a difference.
The problem with Fukien tea, is that they do not show visible signs of problems, until some days past the beginning of the problem.
For example, if you grow Coleus in a flower pot, when the soil approaches being dry, the leaves wilt, and the wilt is very obvious. If you water the coleus the minute you notice the wilt, the plant will be fine, it will perk right back up. If you wait another 24 hours the coleus will still perk right back up. If you wait even longer, the leaves might die, but the succulent stem of the coleus will keep buds alive, and it will produce a new set of leaves, in 4 weeks you will have a coleus with fresh looking leaves as healthy as can be.
With Fukien tea, you dry the soil out, and it needs water today, you may not notice any visible wilt to the leaves. It might be 3 days before the leaves show that there was a problem. If you caught the fact that the soil was dry on the first day the soil was dry, the tree will be fine. If you wait until you see wilted leaves, you will be 3 days too late and the tree simply won't recover. So the problem with Fukien tea is not that it needs anything different than a Coleus, it is that it does not give obvious "early warning" of problems arising. Often you won't notice anything wrong until it is too late to fix it.
Some people find them easy to grow, some people find them difficult. The reason is they are a "difficult to read" tree. Some people are sensitive to the minor changes that are cues to the tree's health, some are not.
One additional piece of advise. Don't base your appraisal of Bonsai as a hobby on just one tree. It is best to have a collection, as a beginner, maybe plan of 5 to 10 trees. A mix of species would be ideal. Often the advice will be "let it grow". Patience is not easy when "letting it grow" is the only thing to do. A collection of 10 or more trees means there is a better chance there will be a tree that needs to have something done, something that will make you feel like you are "doing bonsai". For those of use who are "all in" on the hobby, we average between 25 to 150 trees in various stages of development. A large collection is easy if you are growing outdoors. If you are growing only indoors, a large collection would be anything over 10 trees.
But the key to patience with bonsai is buy more trees, if you are "caught up" on bonsai chores, you don't have enough trees. This makes it possible to set a tree aside to grow for 2 or 3 years without being impatient to work on it.
Hope this helps.