Because you want a Japanese writing tattoo done, that does not mean that you can go to any tattoo artist and expect brilliant results. The artist preferably must know the significance of each of these writing tattoos - but before you locate the artist who can translate the design for you, you must know a few fundamental facts about these writing tattoos.
Essentially, Japanese writing tattoos consist of three characters - hiragana, katakana and kanji. It is important to know that unlike English, the Japanese language do not have any alphabets. Each of these Japanese characters, have their own history of origin, function and style, for instance, the hiragana character is more or less rounded and represents sounds. These characters have to separate identifiable meaning - and are considered to be feminine in the Japanese parlance.
The katakana characters on the other hand were developed by Buddhist monks and have more angular shapes visually. They also signify sounds and do not carry any typical meaning. Then there are the kanji characters - which are originally from China. These carry a meaning and also signify a set of different sounds.
The above information will give you some idea of the different characters which you could incorporate in your tattoos. Now you have to choose the writing style. Just like when you are working on the computer, you might want different font styles - like Arial, Helvetica etc depending on the content of the text and the readability, the Japanese writing tattoos also come in a variety of writing styles.
The three writing styles are: kaisho - or using block letters like ABC, etc. Apparently, Japanese children love this style of writing. The gyousho style of writing takes the cursive route. It is believed that when the Japanese children go up into the middle school level, they write in this style. The last is the sousho style - which is cursive in nature but extremely difficult to read. Somewhat like a scribbled text - which most people find it difficult to decipher.
One of the best options you have is to have a temporary writing tattoo and see for yourself, whether you like the design and what others say about it. You could also show the temporary writing tattoo to an expert in the Japanese, Chinese, Arabic or any other language - to check whether it indeed carries the same significance as you want to.
Spending money, time and energy in getting an intricate and complicated writing tattoo and then not liking it make no sense, as the tattoo will be part of your body permanently.