dont know if you all missed this CRITICAL information. You have not even bought the gear yet? It will probably take at least a week or 2 to get the gear, leaving you 3 weeks at most to prep for the meet. With the week before being more of an opener/rest week depending on how you do it, you essentially have 2 weeks time to get ready.
this is simply not enough time... you are better off getting the gear and either competing completely raw in this meet, or pushing the meet back another 2+ months so you can learn the gear.
i have been training in briefs for about 6mo now and still dont have it down. just recently added a suit and its not even tight. that shit still throws me around like crazy. you need time and practice. dont hurry this, it can lead to trouble b/c you wont possibly know what to be aware of