Should I assemble the cake completely and deliver it assembled or should I assemble 3 tiers and 2 tiers and then put together at the venue???? HELP! thx!
I would remember to take into consideration how much cake you can carry as well as what type of support system you are using. When I have larger cakes to deliver by myself, I usually keep all the tiers separated and assemble on site. That way I know I can carry it all and I also don't have to worry about hitting potholes and going over railroad tracks (and trust me - around my neck of the woods you get a lot of both!)
Safest bet is to assemble on site- I always use the rubbery drawer liner stuff from the dollar store in my trunk and space the cakes out in there- and i flip down the back seat to get some a/c going back there to prevent any heat damage. Just give yourself enough time to add the details you cannot add before it is stacked when you get to the venue and you will be fine.
Better safe than sorry!
Because of the weight factor, I'd assemble on site. Heck, my arms feel like rubber bands when I sit down a lousy 3-tier sometimes!!!
If it was my cake, I would assemble the bottom two tiers in advance, then assemble the rest when I get there. I'm just not very comfortable trying to sit 2 or 3 tiers on top of the rest of the cake. I've done it .... and it worked out fine ..... but I prefer not to do it that way if I can avoid it.
Then just slap whatever border you have to do on it and you're outta there in under 15 minutes! 
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