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Install MacPorts to custom location

Install XCode
run xcode-select –install (maybe as root)¹⁾
Download MacPorts-2.3.4.tar.gz

cd /some/location
tar -xvkpjf ~/Downloads/MacPorts-2.3.4.tar.gz
cd MacPorts-2.3.4
./configure --prefix=/opt/macports --with-applications-dir=/opt/macports/Applications
make
sudo make install
echo "-x11 +no_x11 +quartz" >> /opt/macports/etc/macports/variants.conf
PATH=/opt/macports/bin:$PATH" sudo port -v selfupdate

(For some paranoid reasons, I prefer to not have /opt/macports/bin in my default PATH)

References

All this was basically extracted from the MacPorts Install Guide and the Installation Chapter of the overall Macports Guide. A little bit re-written and condensed to my taste

OSX

¹⁾

There was an issue when running it as non-root related to accepting the licence - don't remember the details

According to the MacPorts Quickstart Guide you should run xcodebuild -license - maybe that helps (too).