Padraic
1) Get ready for the barrage of questions by carefully going over my facts. Possibly even writing them down.
2) Have proof of everything I claimed. Regardless of what many tt'ers say, there is proof to support every tale. Have photocopies and scans of proof readily available.
3) In my first post I'd drop all the proof in the lap of the forum. I'd upload all images, scans and copies first with my post.
4) Set guidelines. If I don't recall certain aspects, tell that in advance. If I can't tell certain aspects, tell that in advance. If I don't know certain aspects, tell that it in advance.
5) Be prepared for skepticism. One claiming to be something preternatural should expect a strong resistance from the general public or in the case of the forum, a defined group of individuals.
6) Regardless of the anticipated reaction to the answer, always answer truthfully. Many times supposed time travelers elaborate and embellish too much, this is what subjects them to "back pedaling".
7) Stay on the "friendly" not on the defensive NOR the offensive. Do not insult the group of natives by insulting their way of life nor their persons. Once you open the door for this type of conversation, expect it to reciprocate back to you from them.
8) Offer up analysis of your person to the full extent. Secrecy only adds skepticism. Be open for examination on both the personal level and the "story" level. Frequently contacting people via either face to face or telephone conversations adds to your credibility as it shows you are more of a real person and not a contrived character.
9) Talk in chat or IRC. This adds credibility due to the ad hoc nature of question and answer sessions. Your delay in answering a question, is an answer in itself.
10) Consider your critics to be your friends and not someone on the "other side of the fence". It is easy to follow what anyone says, it is the critics that need the proof. Once you have, for the most part, sufficed their appetites for proof, you will have proved your case completely.
11) Don't dodge questions. Never answer a question with a question. This only admits to the guilt of a not-so-well laid out storyline by a hoaxer. If you find a question offensive or unanswerable, simply answer in a polite tone of not knowing, etc. However, too many "not knowings" will get you not-believed quickly.
12) Post often and as frequently as possible. The pattern of your posts tells alot about who you are and add a bit of insight to the readers. If you are prompt to answer questions, people will respect you more than say if you have to "take a day" to answer a few simple questions. This also takes away from credibility as it can be a sign of rearranging the storyline.
13) Never shun a question. Simply ignoring a question answers the question in itself. Answer all questions and, if you are afraid that you may have overlooked a question or two, ask if you have. Do not pick and choose the questions you will answer.
The above 13 guidelines is what I would follow if something extraordinary happened to me and I wanted to post about it.