There should be no problem getting on the plane.
As stated by Timo - probably trim position - experiment, but higher until the prop slips/ventilates while accelerating, then back down a notch.
Air pressure - Absolutely Critical, especially in the airdeck and keel.
Tiller extension - It's important to be able to shift the weight forward to get on the plane - you can move back a bit once you are up. You can make one up from white sink waste pipe to see if it helps. A telescopic unit is handy, if/when you buy one.
I can plane mine with a donegaldan, fuel and a bag of ground gear on board. You should have no probs so