I acknowledge nfoto's superior knowledge and experience of ticks, and they are certainly here in numbers . . . but, I haven't had a tick on me for at least the last three years, and I go out rough-walking every single day, sometimes twice. And there are often sheep in the adjoining field, and roe-deer virtually live in our garden.
A few simple precautions - don't wear shorts; tuck trousers into socks if in grass or other vegetation which comes above your boots; and lightly spray boots, socks and trouser-cuffs with insect-repellant if you are worried. (I've never actually done this myself, but it sounds like a good idea.)
The other Scottish menace - the midge - should not be active in early May.